67486 + Interview Questions in Secondary School in Physics Page 78 InterviewSolution

3851.	What is mettlic substance
Answer» Answer: metalic SUBSTANCES are those substance which show metalic properties. like, luster, sonorous, ductility, etc. they have HIGH boiling point and high MELTING point. examples :Iron, SILVER. Explanation: Here is answer hope,it helps you. please do not FOLLOW me any boy.

3851.

What is mettlic substance

Answer»

Answer:

metalic SUBSTANCES are those substance which show metalic properties.

like, luster, sonorous, ductility, etc.

they have HIGH boiling point and high MELTING point.

examples :Iron, SILVER.

Explanation:

Here is answer hope,it helps you.

please do not FOLLOW me any boy.

Discussion

3852.	M=55kgw=_joulesb)s=1.40metersw=_joulesc) s=0.85 metersw=joules
Answer» JOULE is the SI UNIT of WORK DONE....

Discussion

3853.	Q.9) If A and B are two sets1 point*such that,n(A) = 17, n(B) = 21 and n(AUB) = 32, then n(An B) is :06O54O 88
Answer» Answer: The question has already been answered correctly. Let me try a DIFFERENT take on this. Being sure of whats what can help you figure this solution easily...:) n(AUB) means the the NUMBER of ELEMENTS in both A & B. And that includes the ones in common too. n(A∩B) means the ones that in common. n(A-B) refers to the elements that belong to A alone. That means the elements in A excluding the common elements. n(B) is the number of elements that belong to B and that includes the common ones too. Now coming to your question. The total number of elements that can fit in both the sets is 36. While the number of common elements is 16. And also given that n(A-B)=15. Now according to the definitions above....n(A) should include the ones that belong exclusively to A alone and also the ones in common. So, n(A)=n(A-B)+n(A∩B) =15+16 =31 Therefore, n(A) is 31. Now when n(AUB) is 36 and n(A) is 31, it is clear that the elements exclusive to B alone is 5, i.e.36-31. Now n(B)=n(A∩B)+n(B-A) Therefore, n(B) is 16+5 = 21. n(B)=21.

3853.

Q.9) If A and B are two sets1 point*such that,n(A) = 17, n(B) = 21 and n(AUB) = 32, then n(An B) is :06O54O 88

Answer»

Answer:

The question has already been answered correctly. Let me try a DIFFERENT take on this.

Being sure of whats what can help you figure this solution easily...:)

n(AUB) means the the NUMBER of ELEMENTS in both A & B. And that includes the ones in common too.

n(A∩B) means the ones that in common.

n(A-B) refers to the elements that belong to A alone. That means the elements in A excluding the common elements.

n(B) is the number of elements that belong to B and that includes the common ones too.

Now coming to your question.

The total number of elements that can fit in both the sets is 36.

While the number of common elements is 16.

And also given that n(A-B)=15.

Now according to the definitions above....n(A) should include the ones that belong exclusively to A alone and also the ones in common.

So,

n(A)=n(A-B)+n(A∩B)

=15+16

=31

Therefore, n(A) is 31.

Now when n(AUB) is 36 and n(A) is 31, it is clear that the elements exclusive to B alone is 5, i.e.36-31.

Now n(B)=n(A∩B)+n(B-A)

Therefore, n(B) is 16+5 = 21.

n(B)=21.

Discussion

3854.	Graphically prove the position- time and velocity- time equations of motion.
Answer» Answer: Equation for Velocity-Time relation by GRAPHICAL method: First equation of Motion. LET an object is moving with UNIFORM acceleration. ... Draw a line parallel to x-axis DA from point, D from where object starts moving. Draw ANOTHER line BA from point B parallel to y-axis which meets at E at y-axis.

3854.

Graphically prove the position- time and velocity- time equations of motion.

Answer»

Answer:

Equation for Velocity-Time relation by GRAPHICAL method: First equation of Motion. LET an object is moving with UNIFORM acceleration. ... Draw a line parallel to x-axis DA from point, D from where object starts moving. Draw ANOTHER line BA from point B parallel to y-axis which meets at E at y-axis.

Discussion

3855.	Difference between speed and velocity?
Answer» DIFFERENCE BETWEEN SPEED AND VELOCITY Speed :- Speed is the distance a body travels PER unit time. Average Speed is the distance travelled per unit time throughout the whole journey. Speed is a scalar quantity, That means It doesn't follow the vector law of addition and has only MAGNITUDE and no direction. Which ALSO means that Speed can't be negative. Average Speed can't be zero. Velocity :- Velocity is the displacement (change in initial and final position) per unit time. Average Displacement is the total change in the initial and final position of the body throughout the whole journey. Velocity is a vector quantity, That means It follows the vector law of addition, and has both magnitude and direction. Which also means that Velocity can be negative. Average Displacement can be zero Since A body can be on the same position where It was when It started its journey. More Information :- Vector law of Addition :- There are more than one law of vector additon, For example, TRIANGLE law of vector addition, Parallelogram law of vector addition. It states how two vectors would be added resulting into a new vector.

3855.

Difference between speed and velocity?

Answer»

DIFFERENCE BETWEEN SPEED AND VELOCITY

Speed :-

Speed is the distance a body travels PER unit time. Average Speed is the distance travelled per unit time throughout the whole journey.
Speed is a scalar quantity, That means It doesn't follow the vector law of addition and has only MAGNITUDE and no direction. Which ALSO means that Speed can't be negative.
Average Speed can't be zero.

Velocity :-

Velocity is the displacement (change in initial and final position) per unit time. Average Displacement is the total change in the initial and final position of the body throughout the whole journey.
Velocity is a vector quantity, That means It follows the vector law of addition, and has both magnitude and direction. Which also means that Velocity can be negative.
Average Displacement can be zero Since A body can be on the same position where It was when It started its journey.

More Information :-

Vector law of Addition :-

There are more than one law of vector additon, For example, TRIANGLE law of vector addition, Parallelogram law of vector addition.

It states how two vectors would be added resulting into a new vector.

Discussion

3856.	The Position of a particle moving along x axis is given by x=t^3+t^2+t+1 m find. (1) position of particle at t= 0 sec ,at 2 sec,at 3 sec,at 10 sec .
Answer» Given : ➳ Relation b/w position and time has been provided. $\bigstar\:\underline{\boxed{\tt{t^3+t^2+t+1}}}$ To Find : ➨ Position of PARTICLE at t = 0s t = 2s t = 3s t = 10s Solution : ⇒ We can SIMPLY solve this question by PUTTING value of t in given position-time equation. ✪ Position at t = 0 s : $\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_0=(0)^3+(0)^2+(0)+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_0=1m}}}$ ✪ Position at t = 2 s : $\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_2=(2)^3+(2)^2+(2)+1\\ \\ \longrightarrow\tt\:x_2=8+4+2+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_2=15m}}}$ ✪ Position at t = 3 s : $\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_3=(3)^3+(3)^2+(3)+1\\ \\ \longrightarrow\tt\:x_3=27+9+3+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_3=40m}} }$ ✪ Position at t = 10 s : $\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_{10}=(10)^3+(10)^2+(10)+1\\ \\ \longrightarrow\tt\:x_{10}=1000+100+10+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_{10}=1111m}}}$

3856.

The Position of a particle moving along x axis is given by x=t^3+t^2+t+1 m find. (1) position of particle at t= 0 sec ,at 2 sec,at 3 sec,at 10 sec .

Answer»

Given :

➳ Relation b/w position and time has been provided.

$\bigstar\:\underline{\boxed{\tt{t^3+t^2+t+1}}}$

To Find :

➨ Position of PARTICLE at

t = 0s
t = 2s
t = 3s
t = 10s

Solution :

⇒ We can SIMPLY solve this question by PUTTING value of t in given position-time equation.

✪ Position at t = 0 s :

$\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_0=(0)^3+(0)^2+(0)+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_0=1m}}}$

✪ Position at t = 2 s :

$\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_2=(2)^3+(2)^2+(2)+1\\ \\ \longrightarrow\tt\:x_2=8+4+2+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_2=15m}}}$

✪ Position at t = 3 s :

$\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_3=(3)^3+(3)^2+(3)+1\\ \\ \longrightarrow\tt\:x_3=27+9+3+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_3=40m}} }$

✪ Position at t = 10 s :

$\longrightarrow\tt\:x=t^3+t^2+t+1\\ \\ \longrightarrow\tt\:x_{10}=(10)^3+(10)^2+(10)+1\\ \\ \longrightarrow\tt\:x_{10}=1000+100+10+1\\ \\ \longrightarrow\underline{\boxed{\bf{x_{10}=1111m}}}$

Discussion

3857.	आकिक प्रश्न1. एक गिलास में ठीक 100 ग्राम जल लीजिए और उसे 10 मिनट धूप में रखिए। इसका तापमान 4°C ऊपर चला जाता है। एक मिनट में सूर्य कीकितनी ऊष्मा गिलास में पहुँचती है ?[उत्तर 1167.2J]
Answer» Answer: 1167.2J.............

3857.

आकिक प्रश्न1. एक गिलास में ठीक 100 ग्राम जल लीजिए और उसे 10 मिनट धूप में रखिए। इसका तापमान 4°C ऊपर चला जाता है। एक मिनट में सूर्य कीकितनी ऊष्मा गिलास में पहुँचती है ?[उत्तर 1167.2J]

Answer»

Answer:

1167.2J.............

Discussion

3858.	What is the net charge inside abox outward flux =0?
Answer» Explanation: If NET flux outwards flux the surface of the box is zero, then it can be INFERRED that there is no net charge inside the body. The body may have equal AMOUNT of positive and negative CHARGES. Hence, net OUTWARD flux is zero.

3858.

What is the net charge inside abox outward flux =0?

Answer»

Explanation:

If NET flux outwards flux the surface of the box is zero, then it can be INFERRED that there is no net charge inside the body. The body may have equal AMOUNT of positive and negative CHARGES. Hence, net OUTWARD flux is zero.

Discussion

3859.	what is the power of the lamp if its lumious efficiency is 2 watt and its lumious intensity is 42 candela
Answer» Answer: I THINK Explanation: Luminous FLUX=Luminous intensity∗SOLID angle Total solid angle = 4 π So, Luminous flux = 700 x 4 π Luminous flux = Luminous EFFICIENCY x POWER => 700 x 4 π = 8.8 x power => Power of lamp = 1000 W Answer. 10 w

3859.

what is the power of the lamp if its lumious efficiency is 2 watt and its lumious intensity is 42 candela

Answer»

Answer:

I THINK

Explanation:

Luminous FLUX=Luminous intensity∗SOLID angle

Total solid angle = 4 π

So, Luminous flux = 700 x 4 π

Luminous flux = Luminous EFFICIENCY x POWER

=> 700 x 4 π = 8.8 x power

=> Power of lamp = 1000 W

Answer. 10 w

Discussion

3860.	Why did you write ma ??
Answer» ANSWER: helo Explanation: where i have WRITTEN

3860.

Why did you write ma ??

Answer»

ANSWER:

helo

Explanation:

where i have WRITTEN

Discussion

3861.	On what factors does resistance of a conductordefend?
Answer» *Answer:* *Answer:The RESISTANCE of the conductor DEPENDS on the following factors: The TEMPERATURE of the conductor. The cross-sectional AREA of the conductor. LENGTH of the conductor.* *plzz* follow me *friend, always* *there* to *HELP* *YOU*

3861.

On what factors does resistance of a conductordefend?

Answer»

Answer:

Answer:The RESISTANCE of the conductor DEPENDS on the following factors: The TEMPERATURE of the conductor. The cross-sectional AREA of the conductor. LENGTH of the conductor.

plzz follow me friend, always there to HELP YOU

Discussion

3862.	A) Which of the following mirror can form both real and virtual(1) Concave (2) Convex (3) Plane (4) All of the above B) A convex mirror produces a virtual image when object is:-(1) between Centre and focus (2) Anywhere infront of the mirror (3) at the focus (4) at infinityC) According total of reflection :- (1) i/r = Constant (2) Sin i/Sin r = constant(3) i+r = constant (4) i=r E) The front shiny part of a sliver spoon is :-(1) A plane mirror (2) A concave mirror(3) A convex mirror(4) none of this F) Which type of mirror is used as a side view mirror in car :-(1) Plane mirror (2) concave (3) Convex (4) none of these (Please answer those MCQ)
Answer» Answer: A) - 1)CONCAVE mirror B)- 4)at infinity C) - 4)i=r E) - 2)a concave mirror F)- 3)CONVEX mirror.

3862.

A) Which of the following mirror can form both real and virtual(1) Concave (2) Convex (3) Plane (4) All of the above B) A convex mirror produces a virtual image when object is:-(1) between Centre and focus (2) Anywhere infront of the mirror (3) at the focus (4) at infinityC) According total of reflection :- (1) i/r = Constant (2) Sin i/Sin r = constant(3) i+r = constant (4) i=r E) The front shiny part of a sliver spoon is :-(1) A plane mirror (2) A concave mirror(3) A convex mirror(4) none of this F) Which type of mirror is used as a side view mirror in car :-(1) Plane mirror (2) concave (3) Convex (4) none of these (Please answer those MCQ)

Answer»

Answer:

A) - 1)CONCAVE mirror

B)- 4)at infinity

C) - 4)i=r

E) - 2)a concave mirror

F)- 3)CONVEX mirror.

Discussion

3863.	ask your friend to light a incense stick in one corner of the room which phenomenon involved in it?
Answer» EXPLANATION: LIGHTING phenomenon please MARK BRAIN LIST

3863.

ask your friend to light a incense stick in one corner of the room which phenomenon involved in it?

Answer»

EXPLANATION:

LIGHTING phenomenon

please MARK BRAIN LIST

Discussion

3864.	Which Way to Increase Speed Is Not Right 1 Settle Run 2 Marathon 3 Stair Jump 4 ੳ and ੲ Both
Answer» ANSWER: C -PART is CORRECT answer

3864.

Which Way to Increase Speed Is Not Right 1 Settle Run 2 Marathon 3 Stair Jump 4 ੳ and ੲ Both

Answer»

ANSWER:

C -PART is CORRECT answer

Discussion

3865.	Please solve this question I didn't solve give correct answer
Answer» REMARKABLE costly victorious STUCK HOPE HELPS you...

3865.

Please solve this question I didn't solve give correct answer

Answer»

REMARKABLE

costly

victorious

STUCK

HOPE HELPS you...

Discussion

3866.	द्रव्यमान केंद्र से आप क्या समझते हैं
Answer» EXPLANATION: (CENTER of MASS in HINDI) द्रव्यमान केन्द्र की परिभाषा क्या है , उदाहरण , सूत्र , संहति केंद्र : किसी पिण्ड या पिण्डों के निकाय का वह वह बिंदु जहाँ उस पिंड या निकाय के सम्पूर्ण द्रव्यमान को केन्द्रित माना जा सकता है उस बिन्दु को द्रव्यमान केंद्र कहते है।

3866.

द्रव्यमान केंद्र से आप क्या समझते हैं

Answer»

EXPLANATION:

(CENTER of MASS in HINDI) द्रव्यमान केन्द्र की परिभाषा क्या है , उदाहरण , सूत्र , संहति केंद्र : किसी पिण्ड या पिण्डों के निकाय का वह वह बिंदु जहाँ उस पिंड या निकाय के सम्पूर्ण द्रव्यमान को केन्द्रित माना जा सकता है उस बिन्दु को द्रव्यमान केंद्र कहते है।

Discussion

3867.	State any two changes when a force is applied.
Answer» Explanation: Effects of Force. A force acting on an OBJECT CAUSES the object to CHANGE its shape or size, to START moving, to stop moving, to ACCELERATE or decelerate.

3867.

State any two changes when a force is applied.

Answer»

Explanation:

Effects of Force.

A force acting on an OBJECT CAUSES the object to CHANGE its shape or size, to START moving, to stop moving, to ACCELERATE or decelerate.

Discussion

3868.	What is concave mirror and given example?What is convex mirror and given example?
Answer» Explanation: REFLECTING surfaces is BULGED and CURVED outward in a spherical mirror is called convex mirror. Eg- side view mirror in AUTOMOBILES. reflecting surface is bulged and curved INVOLVED inward in a spherical mirror is concave mirror. Eg- makeup mirror.

3868.

What is concave mirror and given example?What is convex mirror and given example?

Answer»

Explanation:

REFLECTING surfaces is BULGED and CURVED outward in a spherical mirror is called convex mirror.

Eg- side view mirror in AUTOMOBILES.

reflecting surface is bulged and curved INVOLVED inward in a spherical mirror is concave mirror.

Eg- makeup mirror.

Discussion

3869.	what can be the speed of an artificial earth satellite travelling at an altitude of 60 miles above earth's surface where g=31 ft/sec^2 Given that radius of earth is 3960 miles
Answer» ANSWER: i THINK QUESTION is INCOMPLETE

3869.

what can be the speed of an artificial earth satellite travelling at an altitude of 60 miles above earth's surface where g=31 ft/sec^2 Given that radius of earth is 3960 miles

Answer»

ANSWER:

i THINK QUESTION is INCOMPLETE

Discussion

3870.	ask your friend to light a incense stick in one corner of the room can you smell its smoke from the opposite corner of that room
Answer» Answer: smoke of INCENSE stick diffuce in air molecules present in airso you are ABLE to SMELL it from the opposite corner of ROOM

3870.

ask your friend to light a incense stick in one corner of the room can you smell its smoke from the opposite corner of that room

Answer»

Answer:

smoke of INCENSE stick diffuce in air molecules present in airso you are ABLE to SMELL it from the opposite corner of ROOM

Discussion

3871.	What effect are seen if magnitude of current is decreased in a solenoid
Answer» ANSWER: If the magnitude of CURRENT is DECREASED in a solenoid,then the magnetic field strength of the solenoid also decreases. They are DIRECTLY proportional to each other.

3871.

What effect are seen if magnitude of current is decreased in a solenoid

Answer»

ANSWER:

If the magnitude of CURRENT is DECREASED in a solenoid,then the magnetic field strength of the solenoid also decreases.

They are DIRECTLY proportional to each other.

Discussion

3872.	Universal law of gravity formula
Answer» Sir Isaac Newton's inspiration for the Law of Universal Gravitation was from the dropping of an apple from a tree. The mathematical FORMULA for GRAVITATIONAL force is F=GMmr2 F = G Mm r 2 where G is the gravitational constant.

Discussion

3873.	Who was the First person to notice the magnetic effect of electric current
Answer» Answer: Hans CHRISTIAN Oersted was the first person to notice that electric current produces magnetic field ,by observing the deflection of COMPASS when it was PLACED NEAR a closed electric CIRCUIT. (through which current was flowing)

3873.

Who was the First person to notice the magnetic effect of electric current

Answer»

Answer:

Hans CHRISTIAN Oersted was the first person to notice that electric current produces magnetic field ,by observing the deflection of COMPASS when it was PLACED NEAR a closed electric CIRCUIT. (through which current was flowing)

Discussion

3874.	Two identical charges +q each are at a distance 2D a test charge free to move on perpendicular bisector of the line joining the two charges the test charge will feel maximum force when it is at a distance from midpoint of line joining of charges1) D 2) 2D 3)D /root 24)D/2
Answer» ANSWER: I don't UNDERSTAND the QUESTION Explanation: I don't understand the question

3874.

Two identical charges +q each are at a distance 2D a test charge free to move on perpendicular bisector of the line joining the two charges the test charge will feel maximum force when it is at a distance from midpoint of line joining of charges1) D 2) 2D 3)D /root 24)D/2

Answer»

ANSWER:

I don't UNDERSTAND the QUESTION

Explanation:

I don't understand the question

Discussion

3875.	A body thrown vertically upward from the ground with a velocity v reaches a maximum height h. If it is thrown at an angle of 45o, with what velocity should it be thrown to reach the same maximum height? In this case at what horizontal distance would it fall to ground. (Hint: to reach same vertical distance, the vertical component of velocity should be same as v. Also, obtain the range in terms of h)
Answer» Answer: the velocity should be $\frac{v}{ \sqrt{2} }$ the horizontal distance should be $\frac{ {v}^{2} }{2g}$ Explanation: Here, the VOLOCITY MUST be .... $v \sin(45)$ and the horizontal distance.... $x = \frac{ {v}^{2} \times ( { \sin(45)) }^{2} \times \sin(90) }{g}$ which gets to.... $x = \frac{ {v}^{2} }{2g}$ I am DONE.

3875.

A body thrown vertically upward from the ground with a velocity v reaches a maximum height h. If it is thrown at an angle of 45o, with what velocity should it be thrown to reach the same maximum height? In this case at what horizontal distance would it fall to ground. (Hint: to reach same vertical distance, the vertical component of velocity should be same as v. Also, obtain the range in terms of h)

Answer»

Answer:

the velocity should be

$\frac{v}{ \sqrt{2} }$

the horizontal distance should be

$\frac{ {v}^{2} }{2g}$

Explanation:

Here,

the VOLOCITY MUST be ....

$v \sin(45)$

and the horizontal distance....

$x = \frac{ {v}^{2} \times ( { \sin(45)) }^{2} \times \sin(90) }{g}$

which gets to....

$x = \frac{ {v}^{2} }{2g}$

I am DONE.

Discussion

3876.	Answer in brief why are curved roads banked
Answer» ANSWER: because when there is no FRICTION the road is tilt to encounter centrifugal force by mg COMPONENT

3876.

Answer in brief why are curved roads banked

Answer»

ANSWER:

because when there is no FRICTION the road is tilt to encounter centrifugal force by mg COMPONENT

Discussion

3877.	➣Theorem of Parallel axis➣Theorem of Perpendicular axis
Answer» $\huge\mathcal\color{maroon} AnSwEr::$ ➣ THEOREM OF PARALLEL AXIS:- • Acc. to this theorem the moment of inertia of a body about an axis is equal to its moment of inertia. • I cm about the parallel axis through its centre of mass + the product of the mass of the body and SQUARE of PERPENDICULAR distance between 2 axis. ➣ THEOREM OF PERPENDICULAR AXIS:- • Acc. to this theorem the moment of inertia of UNIFORM plane lamina about an axis perpendicular to its plane is equal to the sum of its moment of inertia about any two mutually perpendicular axis in its plane intersecting on the 1st axis.

3877.

➣Theorem of Parallel axis➣Theorem of Perpendicular axis

Answer»

$\huge\mathcal\color{maroon} AnSwEr::$

➣ THEOREM OF PARALLEL AXIS:-

• Acc. to this theorem the moment of inertia of a body about an axis is equal to its moment of inertia.

• I cm about the parallel axis through its centre of mass + the product of the mass of the body and SQUARE of PERPENDICULAR distance between 2 axis.

➣ THEOREM OF PERPENDICULAR AXIS:-

• Acc. to this theorem the moment of inertia of UNIFORM plane lamina about an axis perpendicular to its plane is equal to the sum of its moment of inertia about any two mutually perpendicular axis in its plane intersecting on the 1st axis.

Discussion

3878.	do this plz guys ...;-) and listen no spamming okk.‍☠️‍☠️‍☠️
Answer» ANSWER Below with question 1) A hockey ball of mass 200 g travelling at 10 m s-1 is struck by a hockey STICK so as to return it along its original path with a velocity at 5 m s-1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick Answer HELLO DEAR, GIVEN:- Mass of ball (m) = 200 g = 0.2 kg Initial velocity of ball () = 10 m Initial momentum of ball = = 0.2 kg x 10 m = 2 N s Final velocity of ball = - 5 m (Minus sign denotes that ball is moving in opposite direction.) Final momentum of ball = = 0.2 kg x -5 m = -1 N s Change in momentum = Final momentum - Initial momentum = - 1Ns - 2Ns = - 3N s. (Minus sign denotes change in momentum in the direction opposite to the direction of initial momentum of the ball. 2) A bullet of mass 10 g travelling horizontally with a velocity of 150 ms −1 strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. ALSO calculate the magnitude of the force exerted by the wooden block on the bullet. ANSWER Initial velocity of the bullet, u=150 ms −1 Final velocity of the bullet, v=0 Mass of the bullet, m=10 g=0.01 kg Time taken by the bullet to come to rest, t=0.03 s Let distance of penetration be s v=u+at 0=150+a(0.03) ⟹a=−5000 ms −2 (- sign shows retardation) v 2 =u 2 +2as 0=150 2 +2×(−5000)×s s=2.25 m Magnitude of the force exerted by the wooden block, ∣F∣=m∣a∣ ∣F∣=0.01×5000=50 N

3878.

do this plz guys ...;-) and listen no spamming okk.‍☠️‍☠️‍☠️

Answer»

ANSWER Below with question

1) A hockey ball of mass 200 g travelling at 10 m s-1 is struck by a hockey STICK so as to return it along its original path with a velocity at 5 m s-1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick

Answer

HELLO DEAR,

GIVEN:-

Mass of ball (m) = 200 g = 0.2 kg

Initial velocity of ball () = 10 m

Initial momentum of ball = = 0.2 kg x 10 m = 2 N s

Final velocity of ball = - 5 m (Minus sign denotes that ball is moving in opposite direction.)

Final momentum of ball = = 0.2 kg x -5 m = -1 N s

Change in momentum = Final momentum - Initial momentum = - 1Ns - 2Ns = - 3N s. (Minus sign denotes change in momentum in the direction opposite to the direction of initial momentum of the ball.

2) A bullet of mass 10 g travelling horizontally with a velocity of 150 ms

−1

strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. ALSO calculate the magnitude of the force exerted by the wooden block on the bullet.

ANSWER

Initial velocity of the bullet, u=150 ms

−1

Final velocity of the bullet, v=0

Mass of the bullet, m=10 g=0.01 kg

Time taken by the bullet to come to rest, t=0.03 s

Let distance of penetration be s

v=u+at

0=150+a(0.03)

⟹a=−5000 ms

−2

(- sign shows retardation)

v

2

=u

2

+2as

0=150

2

+2×(−5000)×s

s=2.25 m

Magnitude of the force exerted by the wooden block, ∣F∣=m∣a∣

∣F∣=0.01×5000=50 N

Discussion

3879.	If x=at² and y=bt³ then dy/dx is
Answer» Answer dy/dx = 3bt/2a Given x = at² y = bt³ To Find dy/dx Solution x = at² Differentiating the equation with respect to t on both SIDES , we get , $\implies \rm \dfrac{d}{dt}(x)=\dfrac{d}{dt}(at^2)\\\\\implies \rm \dfrac{dx}{dt}=a\dfrac{d}{dt}(t^2)\\\\\implies \rm \dfrac{dx}{dt}=a(2t)\\\\\implies \rm \dfrac{dx}{dt}=2at...(<klux>1</klux>)$ y = bt³ Differentiate the equation with respect to t on both sides , we get , $\implies \rm \dfrac{d}{dt}(y)=\dfrac{d}{dt}(bt^3)\\\\\implies \rm \dfrac{dy}{dt}=b\dfrac{d}{dt}(t^3)\\\\\implies \rm \dfrac{dy}{dt}=b(3t^2)\\\\\implies \rm \dfrac{dy}{dt}=3bt^2...(2)$ Now , SOLVE (2) / (1) , we get , $\implies \rm \dfrac{\frac{dy}{dt}}{\frac{dx}{dt}}=\dfrac{3bt^2}{2at}\\\\\implies \rm \dfrac{dy}{dt}\times \dfrac{dt}{dx}=\dfrac{3bt}{2a}\\\\\implies \rm \dfrac{dy}{dx}=\dfrac{3bt}{2a}$

3879.

If x=at² and y=bt³ then dy/dx is

Answer»

Answer

dy/dx = 3bt/2a

Given

x = at²
y = bt³

To Find

dy/dx

Solution

x = at²

Differentiating the equation with respect to t on both SIDES , we get ,

$\implies \rm \dfrac{d}{dt}(x)=\dfrac{d}{dt}(at^2)\\\\\implies \rm \dfrac{dx}{dt}=a\dfrac{d}{dt}(t^2)\\\\\implies \rm \dfrac{dx}{dt}=a(2t)\\\\\implies \rm \dfrac{dx}{dt}=2at...(<klux>1</klux>)$

y = bt³

Differentiate the equation with respect to t on both sides , we get ,

$\implies \rm \dfrac{d}{dt}(y)=\dfrac{d}{dt}(bt^3)\\\\\implies \rm \dfrac{dy}{dt}=b\dfrac{d}{dt}(t^3)\\\\\implies \rm \dfrac{dy}{dt}=b(3t^2)\\\\\implies \rm \dfrac{dy}{dt}=3bt^2...(2)$

Now , SOLVE (2) / (1) , we get ,

$\implies \rm \dfrac{\frac{dy}{dt}}{\frac{dx}{dt}}=\dfrac{3bt^2}{2at}\\\\\implies \rm \dfrac{dy}{dt}\times \dfrac{dt}{dx}=\dfrac{3bt}{2a}\\\\\implies \rm \dfrac{dy}{dx}=\dfrac{3bt}{2a}$

Discussion

3880.	Find A vector (2i cap-jcap+2kcap) B vector (4i cap+4 j cap - 2k cap)
Answer» ANSWER: -6I-4J+12K Explanation:

3880.

Find A vector (2i cap-jcap+2kcap) B vector (4i cap+4 j cap - 2k cap)

Answer»

ANSWER:

-6I-4J+12K

Explanation:

Discussion

3881.	A torch bulb is rated 5V and 1.5A. The energy consumed when lighted for 30 minutes is
Answer» ANSWER: energy consumed=pt=vAt=5v×1.5A×30×60s =7.5w×1800s =13500ws or 13.5 kwhr hope it will help you. if you LIKE it then pls MARK me as brainliest.

3881.

A torch bulb is rated 5V and 1.5A. The energy consumed when lighted for 30 minutes is

Answer»

ANSWER:

energy consumed=pt=vAt=5v×1.5A×30×60s

=7.5w×1800s

=13500ws or 13.5 kwhr

hope it will help you.

if you LIKE it then pls MARK me as brainliest.

Discussion

3882.	what is the focal length of a convex lens if object placed at a distance of 10 cm from lens and image formed at 8 cm from lens.
Answer» Explanation: The FOCAL length of this convex lens is 10 cm. This means that f=10cm. i) A DIMINISHED real image is FORMED by a convex lens when the OBJECT is beyond 20 cm ( or more than 20 cm) is 25 cm.

3882.

what is the focal length of a convex lens if object placed at a distance of 10 cm from lens and image formed at 8 cm from lens.

Answer»

Explanation:

The FOCAL length of this convex lens is 10 cm. This means that f=10cm. i) A DIMINISHED real image is FORMED by a convex lens when the OBJECT is beyond 20 cm ( or more than 20 cm) is 25 cm.

Discussion

3883.	Answer the question given on the picture.
Answer» Explanation: 2. I.A is a conductor and B is a insulator. II.10^-8 ohm/m III.Resistivity INCREASES with RISE in temperature(in case of conductors) and resistivity decreases with rise in temperature (in case of INSULATORS). Hope it will help you.

3883.

Answer the question given on the picture.

Answer»

Explanation:

2.

I.A is a conductor and B is a insulator.

II.10^-8 ohm/m

III.Resistivity INCREASES with RISE in temperature(in case of conductors) and resistivity decreases with rise in temperature (in case of INSULATORS).

Hope it will help you.

Discussion

3884.	. एक ध्वनि का अवशोषक ध्वनि के स्तर को 20 dB से कम करता हैध्वनि में कितने गुणक से कमी होती है
Answer» EXPLANATION: कार्बन चक्र पर टिप्पणी बताइए

3884.

. एक ध्वनि का अवशोषक ध्वनि के स्तर को 20 dB से कम करता हैध्वनि में कितने गुणक से कमी होती है

Answer»

EXPLANATION:

कार्बन चक्र पर टिप्पणी बताइए

Discussion

3885.	What is discreto natureof charge
Answer» Electric charge, which can be POSITIVE or NEGATIVE, occurs in discrete natural units and is neither CREATED nor DESTROYED.

3885.

What is discreto natureof charge

Answer»

Electric charge, which can be POSITIVE or NEGATIVE, occurs in discrete natural units and is neither CREATED nor DESTROYED.

Discussion

3886.	What is the dimension of normal.reactionof surface?
Answer» EXPLANATION: normal reaction. [′nȯr·məl rē′ak·shən] (MECHANICS) The FORCE exerted by a SURFACE on an object in contact with it which prevents the object from passing through the surface; the force is PERPENDICULAR to the surface, and is the only force that the surface exerts on the object in the absence of frictional forces.

3886.

What is the dimension of normal.reactionof surface?

Answer»

EXPLANATION:

normal reaction. [′nȯr·məl rē′ak·shən] (MECHANICS) The FORCE exerted by a SURFACE on an object in contact with it which prevents the object from passing through the surface; the force is PERPENDICULAR to the surface, and is the only force that the surface exerts on the object in the absence of frictional forces.

Discussion

3887.	What coulombs law tell about?
Answer» Explanation: COULOMB's law, or Coulomb's inverse-square law, is an experimental law of physics that QUANTIFIES the amount of force between two stationary, electrically CHARGED particles. The electric force between charged bodies at rest is conventionally CALLED ELECTROSTATIC force or Coulomb force.

3887.

What coulombs law tell about?

Answer»

Explanation:

COULOMB's law, or Coulomb's inverse-square law, is an experimental law of physics that QUANTIFIES the amount of force between two stationary, electrically CHARGED particles. The electric force between charged bodies at rest is conventionally CALLED ELECTROSTATIC force or Coulomb force.

Discussion

3888.	a solid charged sphere of radius R carries a charge with uniform volume charge density find the ratio of the magnitude of electric field at a distance 2R from the centre to the magnitude of electric field at a distance R by 2 from the centre
Answer» Explanation: A sphere of radius R CARRIES charge such that its volume charge DENSITY is proportional to the SQUARE of the distance from the centre. What is the ratio of the magnitude of the electric field at a distance 2 R from the centre to the magnitude of the electric field at a distance of R/2 from the centre?

3888.

a solid charged sphere of radius R carries a charge with uniform volume charge density find the ratio of the magnitude of electric field at a distance 2R from the centre to the magnitude of electric field at a distance R by 2 from the centre

Answer»

Explanation:

A sphere of radius R CARRIES charge such that its volume charge DENSITY is proportional to the SQUARE of the distance from the centre. What is the ratio of the magnitude of the electric field at a distance 2 R from the centre to the magnitude of the electric field at a distance of R/2 from the centre?

Discussion

3889.	The angle subtended by the moon at a point on the earth is 0°31'(31minute).If the distance ofthe Moon from the Earth is 3.84x10(to the power8 )m.Find the diameter of the Moon.
Answer» Answer: disk info KB DM ONE EN DV GSM nth identify

3889.

The angle subtended by the moon at a point on the earth is 0°31'(31minute).If the distance ofthe Moon from the Earth is 3.84x10(to the power8 )m.Find the diameter of the Moon.

Answer»

Answer:

disk info KB DM ONE EN DV GSM nth identify

Discussion

3890.	give me 5 example of physics around me. some experiment and observation of our daily life. class 9. every little thing can be the example that contains physics in it aroun us in our day to day life. please explain elaborately
Answer» ANSWER: working of fan walking,RUNNING writing jumping paying CRICKET AOR other GAMES

3890.

give me 5 example of physics around me. some experiment and observation of our daily life. class 9. every little thing can be the example that contains physics in it aroun us in our day to day life. please explain elaborately

Answer»

ANSWER:

working of fan

walking,RUNNING

writing

jumping

paying CRICKET AOR other GAMES

Discussion

3891.	How does monorail works, does the magnet 'repels or attract'
Answer» Answer: If the direction of the current is reversed, the poles are reversed. In maglevs that levitate by magnetic REPULSION, the train lies over the guideway. Magnets on top of the guideway are ORIENTED to REPEL similar poles of magnets in the bottom of the MAGLEV. This pushes the train upward into a HOVERING position.

3891.

How does monorail works, does the magnet 'repels or attract'

Answer»

Answer:

If the direction of the current is reversed, the poles are reversed. In maglevs that levitate by magnetic REPULSION, the train lies over the guideway. Magnets on top of the guideway are ORIENTED to REPEL similar poles of magnets in the bottom of the MAGLEV. This pushes the train upward into a HOVERING position.

Discussion

3892.	What is discrete nature of charge?
Answer» ANSWER: The discrete nature of electricity means that, it's STRENGTH depends on amount of electrons it carries, if it carries 1E or 5e or 10E in each case the nature(i.e. strength) of electricity will be different.

3892.

What is discrete nature of charge?

Answer»

ANSWER:

The discrete nature of electricity means that, it's STRENGTH depends on amount of electrons it carries, if it carries 1E or 5e or 10E in each case the nature(i.e. strength) of electricity will be different.

Discussion

3893.	Dimension of normal reaction.of surface?
Answer» Answer: 6 Explanation: 6

3893.

Dimension of normal reaction.of surface?

Answer»

Answer:

6

Explanation:

6

Discussion

3894.	Calculate temperature of sun's outer surface
Answer» Question:- # CALCULATE the temperature of Sun's outer surface. ✨ $\huge\mathcal\color{purple} AnSwEr::$ ➣ The SUNLIGHT is of yellow colour which has [LAMBDA] max. = 4753 °A ➣ 4753 T = 2.9 × 10 -³mK ➣ T = 2.9 × 10 -³ / 4753 × 10-¹° ➣ 6100 K $\huge\mathcal\color{blue}Ans: 6100 K$

3894.

Calculate temperature of sun's outer surface

Answer»

Question:-

# CALCULATE the temperature of Sun's outer surface.

✨ $\huge\mathcal\color{purple} AnSwEr::$

➣ The SUNLIGHT is of yellow colour which has [LAMBDA] max. = 4753 °A

➣ 4753 T = 2.9 × 10 -³mK

➣ T = 2.9 × 10 -³ / 4753 × 10-¹°

➣ 6100 K

$\huge\mathcal\color{blue}Ans: 6100 K$

Discussion

3895.	The union of two or more atoms in a fixed ratio of mass is called?
Answer» ANSWER: EXPLANATION:CHEMICAL COMPOUND

3895.

The union of two or more atoms in a fixed ratio of mass is called?

Answer»

ANSWER:

EXPLANATION:CHEMICAL COMPOUND

Discussion

3896.	R= 10 )24. (a)1+1+1=3R,= 20 212v(i) বর্তনীটোৰ মুঠ ৰােধ কিমান ?(ii) বর্তনীটোৰ মাজেৰে প্রবাহিত মুঠ প্রবাহৰ মান কিমান ?(ii) 102 ৰােধকৰ মাজেৰে প্রবাহিত প্রবাহৰ মান কিমান ?
Answer» ANSWER: POST the QUESTION in ENGLISH. SNEHA ♥️...

3896.

R= 10 )24. (a)1+1+1=3R,= 20 212v(i) বর্তনীটোৰ মুঠ ৰােধ কিমান ?(ii) বর্তনীটোৰ মাজেৰে প্রবাহিত মুঠ প্রবাহৰ মান কিমান ?(ii) 102 ৰােধকৰ মাজেৰে প্রবাহিত প্রবাহৰ মান কিমান ?

Answer»

ANSWER:

POST the QUESTION in ENGLISH.

SNEHA ♥️...

Discussion

3897.	भारतीय संविधान 26 जनवरी 1950 विन लागू हो या सही या गलत
Answer» ANSWER: SAHI HAI YES yes yes yes

3897.

भारतीय संविधान 26 जनवरी 1950 विन लागू हो या सही या गलत

Answer»

ANSWER:

SAHI HAI YES yes yes yes

Discussion

3898.	According to principle of transimissibility of forces, what is the effect of forces on a body?
Answer» ANSWER: The principle of transmissibility states that the POINT of application of a FORCE can be moved anywhere along its line of action without changing the external reaction forces on a RIGID body. ... This difference in stresses may also result in changes in geometry which will in turn affect reaction forces. Explanation: ✌️please mark as brainliest answer✌️

3898.

According to principle of transimissibility of forces, what is the effect of forces on a body?

Answer»

ANSWER:

The principle of transmissibility states that the POINT of application of a FORCE can be moved anywhere along its line of action without changing the external reaction forces on a RIGID body. ... This difference in stresses may also result in changes in geometry which will in turn affect reaction forces.

Explanation:

✌️please mark as brainliest answer✌️

Discussion

3899.	PLEASE HELP ME TO FIND THE SOLUTION
Answer» Explanation: RESULTANT resistance= parallel resistance+series resistance 1/Rp=1/5+1/10=2+1/10=3/10 Rp=10/3 total Rp=10/3+7 =10+21/3=31/3 =10.9 ohm total current=v/R =6/10 =0.6A voltage ACROSS 7 resistor=IR =0.6×10 =6V hope it will help you.

3899.

PLEASE HELP ME TO FIND THE SOLUTION

Answer»

Explanation:

RESULTANT resistance= parallel resistance+series resistance

1/Rp=1/5+1/10=2+1/10=3/10

Rp=10/3

total Rp=10/3+7

=10+21/3=31/3

=10.9 ohm

total current=v/R

=6/10

=0.6A

voltage ACROSS 7 resistor=IR

=0.6×10

=6V

hope it will help you.

Discussion

3900.	According to the joule's law the heat generated due to the flow of current is H=I×I×R×t. Will the heat developed increase on increasing the resistance without changing the voltage? Explain.
Answer» ANSWER: No because resistance decrease the flow of CURRENT so current is less than HEAT PRODUCED is ALSO less. .........

3900.

According to the joule's law the heat generated due to the flow of current is H=I×I×R×t. Will the heat developed increase on increasing the resistance without changing the voltage? Explain.

Answer»

ANSWER:

No

because resistance decrease the flow of CURRENT

so current is less than HEAT PRODUCED is ALSO less. .........

Discussion

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Here is answer hope,it helps you.

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JOULE is the SI UNIT of WORK DONE....

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do this plz guys ...;-) and listen no spamming okk.‍☠️‍☠️‍☠️​

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do this plz guys ...;-) and listen no spamming okk.‍☠️‍☠️‍☠️

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What is discrete nature of charge?

Dimension of normal reaction.of surface?

Calculate temperature of sun's outer surface

भारतीय संविधान 26 जनवरी 1950 विन लागू हो या सही या गलत

According to principle of transimissibility of forces, what is the effect of forces on a body?

According to the joule's law the heat generated due to the flow of current is H=I×I×R×t. Will the heat developed increase on increasing the resistance without changing the voltage? Explain.