13232 + Interview Questions in Physics Page 247 InterviewSolution

12301.	A train is traveling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of -0.5 meters per second square. Find how far the train will go before it is brought to rest.
Answer» A train is traveling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of -0.5 meters per second square. Find how far the train will go before it is brought to rest.

Discussion

12302.	Why is acceleration due to gravity from the earth surface negative?
Answer» Why is acceleration due to gravity from the earth surface negative?

Discussion

12303.	if a body of mass 3 kg is dropped from top of a tower of height 50 m., then K.E.bafter 3 sec will be (ans=735J)
Answer» if a body of mass 3 kg is dropped from top of a tower of height 50 m., then K.E.bafter 3 sec will be (ans=735J)

Discussion

12304.	how does the earth rotates... what exactly the answer could be??
Answer» how does the earth rotates... what exactly the answer could be??

Discussion

12305.	Two resistors of resistance R1and R2 having R1> R2 are connected in parallel. For equivalent resistance R, the correct statement is:
Answer» Two resistors of resistance $R_{1}$ and $R_{2}$ having $R_{1} > R_{2}$ are connected in parallel. For equivalent resistance R, the correct statement is:

Discussion

12306.	Sound wave is a
Answer» Sound wave is a

Discussion

12307.	If an object is dropped from a height and it hits the ground with a velocity of 50m/s, then its initial velocity is taken as
Answer» If an object is dropped from a height and it hits the ground with a velocity of 50m/s, then its initial velocity is taken as

Discussion

12308.	Which of the given relations about the above elements are correct. I) 12C II) 14C III) 14N IV) 16O
Answer» Which of the given relations about the above elements are correct. I) $^{12} C$ II) $^{14} C$ III) $^{14} N$ IV) $^{16} O$

Discussion

12309.	Use the following information to answer the next question. Figure I shows a pair of charged aluminium leaves that are attached to a metal strip. The leaves are shown as moving away from each other because they are charged by the same kind of charge. When Hari touches the metal strip, the leaves move toward each other and become relaxed, as shown in figure II. The leaves move toward each other because
Answer» Use the following information to answer the next question. Figure I shows a pair of charged aluminium leaves that are attached to a metal strip. The leaves are shown as moving away from each other because they are charged by the same kind of charge. When Hari touches the metal strip, the leaves move toward each other and become relaxed, as shown in figure II. The leaves move toward each other because

12309.

Use the following information to answer the next question. Figure I shows a pair of charged aluminium leaves that are attached to a metal strip. The leaves are shown as moving away from each other because they are charged by the same kind of charge. When Hari touches the metal strip, the leaves move toward each other and become relaxed, as shown in figure II. The leaves move toward each other because

Answer»

Use the following information to answer the next question.

Figure I shows a pair of charged aluminium leaves that are attached to a metal strip. The leaves are shown as moving away from each other because they are charged by the same kind of charge.

When Hari touches the metal strip, the leaves move toward each other and become relaxed, as shown in figure II.

The leaves move toward each other because

Discussion

12310.	A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is 27∘C and its melting point is 327∘C. Latent heat of fusion of lead =2.5 × 104 J kg−1 and Specific heat capacity of lead =125 J kg−1 K−1.
Answer» A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is $27^{\circ} C$ and its melting point is $327^{\circ} C$ . Latent heat of fusion of lead $= 2.5 \times 10^{4} J k g^{- 1}$ and Specific heat capacity of lead $= 125 J k g^{- 1} K^{- 1}$ .

12310.

A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is 27∘C and its melting point is 327∘C. Latent heat of fusion of lead =2.5 × 104 J kg−1 and Specific heat capacity of lead =125 J kg−1 K−1.

Answer»

A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet.
The initial temperature of the bullet is $27^{\circ} C$ and its melting point is $327^{\circ} C$ .

Latent heat of fusion of lead $= 2.5 \times 10^{4} J k g^{- 1}$ and

Specific heat capacity of lead $= 125 J k g^{- 1} K^{- 1}$ .

Discussion

12311.	Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0∘C and 90∘C respectively. The temperature of junction of the three rods will be
Answer» Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at $0^{\circ} C$ and $90^{\circ} C$ respectively. The temperature of junction of the three rods will be

Discussion

12312.	If you drop a stone and a piece of paper to the earth, they don't take the same time to reach the earth because
Answer» If you drop a stone and a piece of paper to the earth, they don't take the same time to reach the earth because

Discussion

12313.	Which of the following statements are true.
Answer» Which of the following statements are true.

Discussion

12314.	A small block of wood is held completely immersed in (i) water, (ii) glycerine and then released. In each case, what do you observe ? Explain the difference in your observation in the two cases.
Answer» A small block of wood is held completely immersed in (i) water, (ii) glycerine and then released. In each case, what do you observe ? Explain the difference in your observation in the two cases.

Discussion

12315.	The unit of retardation is (a) m s−1 (b) m s−2 (c) m (d) m s2
Answer» The unit of retardation is (a) $m s^{- 1}$ (b) $m s^{- 2}$ (c) $m$ (d) $m s^{2}$

12315.

The unit of retardation is (a) m s−1 (b) m s−2 (c) m (d) m s2

Answer»

The unit of retardation is

(a) $m s^{- 1}$ (b) $m s^{- 2}$

(c) $m$ (d) $m s^{2}$

Discussion

12316.	Define the term wave velocity. Write its S.I. unit.
Answer» Define the term wave velocity. Write its S.I. unit.

Discussion

12317.	Question 2 A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is, (a) u2 (b) u22g (c) u2g (d) u2g
Answer» Question 2 A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is, (a) $\frac{u}{2}$ (b) $\frac{u^{2}}{2 g}$ (c) $\frac{u^{2}}{g}$ (d) $\frac{u}{2 g}$

Discussion

12318.	Which of the following pair of quantities cannot be simultaneously non-zero and constant for a body?
Answer» Which of the following pair of quantities cannot be simultaneously non-zero and constant for a body?

Discussion

12319.	A bullet of mass 5g travelling with a velocity of 18 km/h penetrates a wodden block and comes to rest in 0.01s . Find (1) the distance it penetrates in the wooden block (2) the retarding force of the block
Answer» A bullet of mass 5g travelling with a velocity of 18 km/h penetrates a wodden block and comes to rest in 0.01s . Find (1) the distance it penetrates in the wooden block (2) the retarding force of the block

12319.

A bullet of mass 5g travelling with a velocity of 18 km/h penetrates a wodden block and comes to rest in 0.01s . Find (1) the distance it penetrates in the wooden block (2) the retarding force of the block

Answer»

A bullet of mass 5g travelling with a velocity of 18 km/h penetrates a wodden block and comes to rest in 0.01s . Find

(1) the distance it penetrates in the wooden block

(2) the retarding force of the block

Discussion

12320.	Newton's Reservations: While Newton was able to formulate his law of gravity, he was deeply uncomfortable with the notion of "action at a distance" which his equations implied. In 1692, in his third letter to Bentley, he wrote: "That one body may act upon another at a distance through a vacuum without the mediation of anything else”. He never, in his words, "assigned the cause of this power". In all other cases, he used the phenomenon of motion to explain the origin of various forces acting on bodies, but in the case of gravity, he was unable to experimentally identify the motion that produces the force of gravity. Moreover, he refused to even offer a hypothesis as to the cause of this force on grounds that to do so was contrary to sound science. He commented that gravity is fundamental to all the "phenomena of nature". These fundamental phenomena are still under investigation. Which of the given options can be inferred from the above paragraph?
Answer» Newton's Reservations: While Newton was able to formulate his law of gravity, he was deeply uncomfortable with the notion of "action at a distance" which his equations implied. In 1692, in his third letter to Bentley, he wrote: "That one body may act upon another at a distance through a vacuum without the mediation of anything else”. He never, in his words, "assigned the cause of this power". In all other cases, he used the phenomenon of motion to explain the origin of various forces acting on bodies, but in the case of gravity, he was unable to experimentally identify the motion that produces the force of gravity. Moreover, he refused to even offer a hypothesis as to the cause of this force on grounds that to do so was contrary to sound science. He commented that gravity is fundamental to all the "phenomena of nature". These fundamental phenomena are still under investigation. Which of the given options can be inferred from the above paragraph?

12320.

Newton's Reservations: While Newton was able to formulate his law of gravity, he was deeply uncomfortable with the notion of "action at a distance" which his equations implied. In 1692, in his third letter to Bentley, he wrote: "That one body may act upon another at a distance through a vacuum without the mediation of anything else”. He never, in his words, "assigned the cause of this power". In all other cases, he used the phenomenon of motion to explain the origin of various forces acting on bodies, but in the case of gravity, he was unable to experimentally identify the motion that produces the force of gravity. Moreover, he refused to even offer a hypothesis as to the cause of this force on grounds that to do so was contrary to sound science. He commented that gravity is fundamental to all the "phenomena of nature". These fundamental phenomena are still under investigation. Which of the given options can be inferred from the above paragraph?

Answer»

Newton's Reservations:
While Newton was able to formulate his law of gravity, he was deeply uncomfortable with the notion of "action at a distance" which his equations implied. In 1692, in his third letter to Bentley, he wrote: "That one body may act upon another at a distance through a vacuum without the mediation of anything else”. He never, in his words, "assigned the cause of this power". In all other cases, he used the phenomenon of motion to explain the origin of various forces acting on bodies, but in the case of gravity, he was unable to experimentally identify the motion that produces the force of gravity. Moreover, he refused to even offer a hypothesis as to the cause of this force on grounds that to do so was contrary to sound science. He commented that gravity is fundamental to all the "phenomena of nature". These fundamental phenomena are still under investigation.

Which of the given options can be inferred from the above paragraph?

Discussion

12321.	Which of the following is an example of uniform circular motion?
Answer» Which of the following is an example of uniform circular motion?

Discussion

12322.	Why do train have buffers in between the comartments?
Answer» Why do train have buffers in between the comartments?

Discussion

12323.	If two boys are pulling a box in the same direction with 85 N and 65 N force. Net displacement of the box is 18 m. Find the net work done.
Answer» If two boys are pulling a box in the same direction with $85 N$ and $65 N$ force. Net displacement of the box is $18 m .$ Find the net work done.

Discussion

12324.	Fill in the following blanks with suitable words : (a) Force acting on a unit area is called ___. (b) It is the ___ force which makes objects appear lighter in water. (c) A heavy ship floats in water because its ___ density is less than that of water. (d) In fluids (liquids and gases), pressure acts in ___ directions, and pressure ___ as the depth increase. (e) In order to sink in a fluid, the density of an object must be___ than the ___ of the fluid. (f) Snow shoes work by spreading out a person's ___ over a much bigger ___. (g) If the area of a snow shoe is five times ___ than the area of an ordinary shoe, then the pressure of a snow shoe on the snow is five times __ _.
Answer» Fill in the following blanks with suitable words : (a) Force acting on a unit area is called ___. (b) It is the ___ force which makes objects appear lighter in water. (c) A heavy ship floats in water because its ___ density is less than that of water. (d) In fluids (liquids and gases), pressure acts in ___ directions, and pressure ___ as the depth increase. (e) In order to sink in a fluid, the density of an object must be___ than the ___ of the fluid. (f) Snow shoes work by spreading out a person's ___ over a much bigger ___. (g) If the area of a snow shoe is five times ___ than the area of an ordinary shoe, then the pressure of a snow shoe on the snow is five times __ _.

Discussion

12325.	For a simple pendulum bob, which of the following energies increase as it approaches the equilibrium position?
Answer» For a simple pendulum bob, which of the following energies increase as it approaches the equilibrium position?

Discussion

12326.	An electric current is said to be flowing through a wire when:
Answer» An electric current is said to be flowing through a wire when:

Discussion

12327.	16 bulbs of 40w are used for 6 hours a day along with 1 bulb of 100w for 2 hours. Calculate units of energy consumed in 20 days
Answer» 16 bulbs of 40w are used for 6 hours a day along with 1 bulb of 100w for 2 hours. Calculate units of energy consumed in 20 days

Discussion

12328.	Physics says that a body after travelling a short distance stops because of frictional force but according to some a body starts moving because of applied force to it and stops because the applied energy exhausts after travelling a certain distance.so which is true and explain why.
Answer» Physics says that a body after travelling a short distance stops because of frictional force but according to some a body starts moving because of applied force to it and stops because the applied energy exhausts after travelling a certain distance.so which is true and explain why.

Discussion

12329.	Calculate the potential energy of a body of mass 5 kg at height of 2 m from the ground
Answer» Calculate the potential energy of a body of mass 5 kg at height of 2 m from the ground

Discussion

12330.	Who named the gravitation?
Answer» Who named the gravitation?

Discussion

12331.	A carpenter, while driving a screw through a wooden block, of thickness 1.5 cm, notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:
Answer» A carpenter, while driving a screw through a wooden block, of thickness 1.5 cm, notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:

12331.

A carpenter, while driving a screw through a wooden block, of thickness 1.5 cm, notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:

Answer»

A carpenter, while driving a screw through a wooden block, of thickness 1.5 cm, notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:

Discussion

12332.	The energy supply being cut-off, an electric heater element cools down to the temperature of its surroundings, but it will not cool further because:
Answer» The energy supply being cut-off, an electric heater element cools down to the temperature of its surroundings, but it will not cool further because:

Discussion

12333.	What does the third law of motion state?
Answer» What does the third law of motion state?

Discussion

12334.	Suppose we jump from a bus facing backward and started running in the opposite side of motion of the bus then in which direction we would fall ?
Answer» Suppose we jump from a bus facing backward and started running in the opposite side of motion of the bus then in which direction we would fall ?

Discussion

12335.	The melting point of ice is ___ degree celsius.
Answer» The melting point of ice is ___ degree celsius.

Discussion

12336.	The Specific gravity (Relative density) of a material is 0.76. It will ___________ in a beaker filled with oil.
Answer» The Specific gravity (Relative density) of a material is 0.76. It will ___________ in a beaker filled with oil.

Discussion

12337.	For distance vs time graph if the graph is a curve, then___
Answer» For distance vs time graph if the graph is a curve, then___

Discussion

12338.	The velocity of a car decreases from 20 m/s to 10 m/s in a certain time interval. Find its retardation if the distance covered during this time is 300 m.
Answer» The velocity of a car decreases from 20 m/s to 10 m/s in a certain time interval. Find its retardation if the distance covered during this time is 300 m.

Discussion

12339.	State the use of echo by a bat, dolphin and fisherman.
Answer» State the use of echo by a bat, dolphin and fisherman.

Discussion

12340.	A force acts for 10 s on a stationary body of mass 100 kg after which the force cases to act. The body moves through a distance of 100 m in the next 5 s. Calculate: (i) the velocity acquired by the body (ii) the acceleration produced by the force, and (iii) the magnitude of the force.
Answer» A force acts for 10 s on a stationary body of mass 100 kg after which the force cases to act. The body moves through a distance of 100 m in the next 5 s. Calculate: (i) the velocity acquired by the body (ii) the acceleration produced by the force, and (iii) the magnitude of the force.

12340.

A force acts for 10 s on a stationary body of mass 100 kg after which the force cases to act. The body moves through a distance of 100 m in the next 5 s. Calculate: (i) the velocity acquired by the body (ii) the acceleration produced by the force, and (iii) the magnitude of the force.

Answer»

A force acts for 10 s on a stationary body of mass 100 kg after which the force cases to act. The body moves through a distance of 100 m in the next 5 s. Calculate:

(i) the velocity acquired by the body
(ii) the acceleration produced by the force, and
(iii) the magnitude of the force.

Discussion

12341.	The velocity-time graph of a body with a constant acceleration is:
Answer» The velocity-time graph of a body with a constant acceleration is:

Discussion

12342.	Ozone is an important constituent of stratosphere because it_________.
Answer» Ozone is an important constituent of stratosphere because it_________.

Discussion

12343.	Please can you answer again as my doubt has not cleared and send it clearly. My question is that a cyclist goes around a circular track once every 2minutes. If radius of the circular track is 110metres,calculate the speed of cyclist. What is his average velocity?
Answer» Please can you answer again as my doubt has not cleared and send it clearly. My question is that a cyclist goes around a circular track once every 2minutes. If radius of the circular track is 110metres,calculate the speed of cyclist. What is his average velocity?

Discussion

12344.	A cheetah can accelerate from rest at the speed of 4 m/s2 i. What will be the velocity attained by it in 100 s ii. How far will it travel in this duration?
Answer» A cheetah can accelerate from rest at the speed of 4 m/ $s^{2}$ i. What will be the velocity attained by it in 100 s ii. How far will it travel in this duration?

12344.

A cheetah can accelerate from rest at the speed of 4 m/s2 i. What will be the velocity attained by it in 100 s ii. How far will it travel in this duration?

Answer»

A cheetah can accelerate from rest at the speed of 4 m/ $s^{2}$

i. What will be the velocity attained by it in 100 s

ii. How far will it travel in this duration?

Discussion

12345.	A 60 m long train moving on a straight level track passes a pole in 5 seconds.find the speed of the train and the time it will take to cross a 540 m long bridge ?
Answer» A 60 m long train moving on a straight level track passes a pole in 5 seconds.find the speed of the train and the time it will take to cross a 540 m long bridge ?

Discussion

12346.	A car, initially at rest, is given a uniform acceleration of a 0.5 m/s2 for 20 s. The car then moves with uniform velocity for 20 s. Brakes are then applied and the car is brought to rest in10 s. Find the total distance covered by the car.
Answer» A car, initially at rest, is given a uniform acceleration of a 0.5 $m / s^{2}$ for 20 s. The car then moves with uniform velocity for 20 s. Brakes are then applied and the car is brought to rest in10 s. Find the total distance covered by the car.

Discussion

12347.	Which of the following graph correctly shows the variation of atmospheric pressure with altitude?
Answer» Which of the following graph correctly shows the variation of atmospheric pressure with altitude?

Discussion

12348.	Fill in the following blanks with suitable words: (a) Displacement is a ...................quantity whereas distance is a ...............quantity. (b) The physical quantity which gives both, the speed and direction of motion of a body is called its ............. (c) A motorcycle has a steady...........of 3 m/s2. This means that every.............its ......... increases by .......... (d) Velocity is the rate of change of .............. It is measured in .............. (e) Acceleration is the rate of change of....................... It is measured in.....................
Answer» Fill in the following blanks with suitable words: (a) Displacement is a ...................quantity whereas distance is a ...............quantity. (b) The physical quantity which gives both, the speed and direction of motion of a body is called its ............. (c) A motorcycle has a steady...........of 3 $m / s^{2}$ . This means that every.............its ......... increases by .......... (d) Velocity is the rate of change of .............. It is measured in .............. (e) Acceleration is the rate of change of....................... It is measured in.....................

12348.

Fill in the following blanks with suitable words: (a) Displacement is a ...................quantity whereas distance is a ...............quantity. (b) The physical quantity which gives both, the speed and direction of motion of a body is called its ............. (c) A motorcycle has a steady...........of 3 m/s2. This means that every.............its ......... increases by .......... (d) Velocity is the rate of change of .............. It is measured in .............. (e) Acceleration is the rate of change of....................... It is measured in.....................

Answer»

Fill in the following blanks with suitable words:

(a) Displacement is a ...................quantity whereas distance is a ...............quantity.

(b) The physical quantity which gives both, the speed and direction of motion of a body is called its .............

(c) A motorcycle has a steady...........of 3 $m / s^{2}$ . This means that every.............its ......... increases by ..........

(d) Velocity is the rate of change of .............. It is measured in ..............

(e) Acceleration is the rate of change of....................... It is measured in.....................

Discussion

12349.	After 22 seconds of lightning, a thundering sound was heard. Calculate the height of the clouds which caused this lightning. Given, Speed of light = 3 x 108 m/s and Speed of sound = 340 m/s.
Answer» After 22 seconds of lightning, a thundering sound was heard. Calculate the height of the clouds which caused this lightning. Given, Speed of light = 3 x $10^{8}$ m/s and Speed of sound = 340 m/s.

Discussion

12350.	A body is thrown vertically upwards and rises to a height of 10m. The velocity with which the body was thrown upwards is : (g = 9.8m/s2)
Answer» A body is thrown vertically upwards and rises to a height of 10m. The velocity with which the body was thrown upwards is : (g = 9.8 $m / s^{2}$ )

Discussion

Explore topic-wise InterviewSolutions in .

A train is traveling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of -0.5 meters per second square. Find how far the train will go before it is brought to rest.

Why is acceleration due to gravity from the earth surface negative?

if a body of mass 3 kg is dropped from top of a tower of height 50 m., then K.E.bafter 3 sec will be (ans=735J)

how does the earth rotates... what exactly the answer could be??

Two resistors of resistance R1and R2 having R1&gt; R2 are connected in parallel. For equivalent resistance R, the correct statement is:

Sound wave is a

If an object is dropped from a height and it hits the ground with a velocity of 50m/s, then its initial velocity is taken as

Which of the given relations about the above elements are correct. I) 12C II) 14C III) 14N IV) 16O

Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0∘C and 90∘C respectively. The temperature of junction of the three rods will be

If you drop a stone and a piece of paper to the earth, they don't take the same time to reach the earth because

Which of the following statements are true.

A small block of wood is held completely immersed in (i) water, (ii) glycerine and then released. In each case, what do you observe ? Explain the difference in your observation in the two cases.

The unit of retardation is (a) m s−1 (b) m s−2 (c) m (d) m s2

Define the term wave velocity. Write its S.I. unit.

Question 2 A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is, (a) u2 (b) u22g (c) u2g (d) u2g

Which of the following pair of quantities cannot be simultaneously non-zero and constant for a body?

A bullet of mass 5g travelling with a velocity of 18 km/h penetrates a wodden block and comes to rest in 0.01s . Find (1) the distance it penetrates in the wooden block (2) the retarding force of the block

Which of the following is an example of uniform circular motion?

Why do train have buffers in between the comartments?

If two boys are pulling a box in the same direction with 85 N and 65 N force. Net displacement of the box is 18 m. Find the net work done.

For a simple pendulum bob, which of the following energies increase as it approaches the equilibrium position?

An electric current is said to be flowing through a wire when:

16 bulbs of 40w are used for 6 hours a day along with 1 bulb of 100w for 2 hours. Calculate units of energy consumed in 20 days

Physics says that a body after travelling a short distance stops because of frictional force but according to some a body starts moving because of applied force to it and stops because the applied energy exhausts after travelling a certain distance.so which is true and explain why.

Calculate the potential energy of a body of mass 5 kg at height of 2 m from the ground

Who named the gravitation?

A carpenter, while driving a screw through a wooden block, of thickness 1.5 cm, notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:

The energy supply being cut-off, an electric heater element cools down to the temperature of its surroundings, but it will not cool further because:

What does the third law of motion state?

Suppose we jump from a bus facing backward and started running in the opposite side of motion of the bus then in which direction we would fall ?

The melting point of ice is ___ degree celsius.

The Specific gravity (Relative density) of a material is 0.76. It will ___________ in a beaker filled with oil.

For distance vs time graph if the graph is a curve, then___

The velocity of a car decreases from 20 m/s to 10 m/s in a certain time interval. Find its retardation if the distance covered during this time is 300 m.

State the use of echo by a bat, dolphin and fisherman.

A force acts for 10 s on a stationary body of mass 100 kg after which the force cases to act. The body moves through a distance of 100 m in the next 5 s. Calculate: (i) the velocity acquired by the body (ii) the acceleration produced by the force, and (iii) the magnitude of the force.

The velocity-time graph of a body with a constant acceleration is:

Ozone is an important constituent of stratosphere because it_________.

Please can you answer again as my doubt has not cleared and send it clearly. My question is that a cyclist goes around a circular track once every 2minutes. If radius of the circular track is 110metres,calculate the speed of cyclist. What is his average velocity?

A cheetah can accelerate from rest at the speed of 4 m/s2 i. What will be the velocity attained by it in 100 s ii. How far will it travel in this duration?

A 60 m long train moving on a straight level track passes a pole in 5 seconds.find the speed of the train and the time it will take to cross a 540 m long bridge ?

A car, initially at rest, is given a uniform acceleration of a 0.5 m/s2 for 20 s. The car then moves with uniform velocity for 20 s. Brakes are then applied and the car is brought to rest in10 s. Find the total distance covered by the car.

Which of the following graph correctly shows the variation of atmospheric pressure with altitude?

After 22 seconds of lightning, a thundering sound was heard. Calculate the height of the clouds which caused this lightning. Given, Speed of light = 3 x 108 m/s and Speed of sound = 340 m/s.

A body is thrown vertically upwards and rises to a height of 10m. The velocity with which the body was thrown upwards is : (g = 9.8m/s2)

Two resistors of resistance R1and R2 having R1> R2 are connected in parallel. For equivalent resistance R, the correct statement is: