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A wave travelling along a string is described by,

y(x,t)=0.005sin(80.0x−3.0t), in which the numerical constants are in SI UNITS (0.005 m, 80.0 rad m

−1

and 3.0 rad s

−1

). Calculate :

(a) the amplitude

(b) the wavelength

(C) the PERIOD and frequency of the wave.

Also, calculate the displacement y of the wave at a distance x = 30.0 CM and TIME t = 20 s?

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Answer

We know that

general equation of wave

y(x,t)=Asin(kx−ωt)

comparing this equation with given equation

1) A=0.005m → amplitude

k=80

ω=3

2) λ=

k

2π

=

80

2π

=(

40

π

)m

3) Time period T=

ω

2π

=

3

2π

sec

frequency f=

T

1

=

2π

3

Hz

4) Displacement at x=0.3m

t=20 sec

y=0.005sin(80×0.3−3×20)

=0.005sin(24−60)=0.005sin(−36)

=0.00495m

y=4.9mm.

ANSWER:

(B)

EXPLANATION:

Answer:

CI

Explanation:

The odd ONE out is CI as there are 2 ALPHABETS and the others have one alphabet.

Answer:

h(t) = (-1/2)gt2 + UT

a = -g/2, B = u

-b/2a = -u/(-g) = u/g

h(u/g) = (-1/2)g(u/g)2 + u2/g

= -u2/2g + u2/g

= (-u2+2u2)/(2g)

= u2/2g

The MAXIMUM height is u2/2g

occurring at time t=u/g

Just another way to look at the PROBLEM,

ARRIVING at the same answer as Patrick D.

Kinetic ENERGY = [MASS × VELOCITY2] × 2-1. Or, K.E = [M1 L0 T0] × [M0 L1 T-1]2 = [M1 L2 T-2] THEREFORE, Kinetic Energy is dimensionally represented as [M1 L2 T-2].

ANSWER:

AD and BC is 8 OD is 4 DC is 8 CE is 8

Explanation:

Ok

ANSWER:

THREE EQUATIONS of Motion are v = u + at; s = ut + (1/2) at² and v² = u² + 2as and these can be derived with the help of velocity time graphs using definition acceleration. ... Speed is SCALAR quantity, is the rate at which an object covers its distance and AVERAGE speed is the ratio of total distance by total time.

EXPLANATION:

'Direct MEASUREMENT' refers to measuring exactly the thing that you are looking to measure, while 'indirect measurement' MEANS that you're measuring SOMETHING by measuring something else. For EXAMPLE of direct measurement is weight, distance, and so on.

ANSWER:

किसी आवेशित कण के द्रव्यमान और आवेश पर चाल (SPEED) का क्या प्रभाव पड़ता है? चाल बढ़ने से द्रव्यमान बढता है यद चाल प्रकाश की चाल की कोटि की है तथा आवेश नियत रहता है।

EXPLANATION:

यही उत्तर है ओके

ANSWER:

Therefore, the TOTAL number of ELECTRONS for n= 4 shells having -1/2 spin will be 16.

Explanation:

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Answer:

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Explanation:

SECOND PICTURE

ANSWER:

C . ACCELERATION is the answer

Answer:

EXPLANATION:

displacement may be ZERO. Take the SECOND HAND of any clock.

b- Its magnitude can't be greater than the distance travelled by the object.

c- It may be equal to distance or may not be equal to distance  

Hence correct answer is C

Answer:

15J

Explanation:

A/F

H=I^2RT

= (0.5)*12*5

=2.5*60

= 15J

Explanation :

here,

• u = Initial Velocity = 20m/s

Finial Velocity = v = 0m/s

a = - 10m/s²

• We took 'a' negative as it is GOING against GRAVITATIONAL pull.

For Calculating :

Formula :

2as = v² - u²

• Transposing The Terms

Time Taken :

It reach 20m froma a HEIGHT of 25m

• Finding Distance

Since,

• Object started falling from 45m

So Initial Velocity = u = 0

Acceleration = - 10m/s² =

• Finding Time Taken :

Using Formula

For TOTAL Time :

• Adding :

So,

the stone will reach the ground in 5 seconds after being thrown upwards from tower.

The CHARACTERISTICS of an equipotential SURFACE are: Potential remains the same at all the points on equipotential surface. No work is required to move a CHARGE on an equipotential surface. No two equipotential surfaces can ever intersect each other.

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Answer:

ACCELERATION a = 2.5 m/s²

Explanation:

1) accln = slope of AC

a = (10-5)/(2-0)

= 5/2

= 2.5 m/s²

2) The GIVEN slope SHOWS the PARTICLE is moving with uniform acceleration.

Answer:

Solution:

mass M of the piece of BRASS = 252 g Volume of the piece of volume = 30\ cm^330 cm

3

(i) density d = \frac{M}{V}

V

M

= \frac{252}{30}=8.4\ g\ cm^{-3}

30

252

=8.4 g cm

−3

since, M = 252g = 0.252 KG

V = 30\ cm^330 cm

3

= 30\times10^{-6}\ m^{-3}30×10

−6

m

−3

Density d = \frac{0.252\ kg}{30\times10^{-6}\ m^{-3}}=\frac{0.252\ kg}{30\times\frac{1}{1000000}m^{-3}}

30×10

−6

m

−3

0.252 kg

=

30×

1000000

1

m

−3

0.252 kg

=

\frac{0.252\times1000000\ kg}{30\ m^3}=\frac{25200}{3}kg\ m^{-3}\ =\ 8400\ kg\ m^{-3}

30 m

3

0.252×1000000 kg

=

3

25200

kg m

−3

= 8400 kg m

−3

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Answer:

Every heartbeat results in blood moving forward through your ARTERIES. You can feel this movement as a 'pulse' by placing two FINGERS over the artery of your WRIST. Your pulse rate TELLS you how fast your heart is BEATING.

ANSWER:

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Answer:

Projectile motion is the motion of an object THROWN or projected into the air, SUBJECT to only the acceleration of GRAVITY. The object is called a projectile, and its path is called its trajectory. The motion of falling objects, as covered in Problem-Solving BASICS for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. In this section, we CONSIDER two-dimensional projectile motion, such as that of a football or other object for which air resistance is negligible.

ANSWER:

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EXPLANATION:

Some fibres are CALLED SYNTHETIC because they are not made from natural fibres. Instead, they are made by chemical processing of petrochemicals. The synthetic fibres are made up of very large UNITS called polymers. Some of the synthetic fibres are - nylon, RAYON, acrylon.

ANSWER:

Answer:

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Explanation:

Answer:

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Explanation:

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Answer:

Solid calcium OXIDE REACTS vigorously with water to FORM calcium hydroxideaccompanied by the liberation of heat. This process is called SLAKING oflime. Calcium hydroxidedissolves in water to formits SOLUTION called lime water.

Answer:

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Answer:

Fleming devised the left-hand RULE for motors and right-hand rule for generators to HELP himself and his students REMEMBER the relationship governing the directions of ELECTRIC current, electric FIELD, and force.

ANSWER:

8 is the answer because the ph level will DECREASING in turning BLUE litmus to RED

EXPLANATION:

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Explanation:

ELECTRIC charge is the PHYSICAL property of matter that causes it to experience a FORCE when placed in an electromagnetic FIELD. There are TWO types of electric charge: positive and negative. Like charges repel each other and unlike charges attract each other.

Explanation:

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ANSWER:

milapada and MITHA is answer

ANSWER:

AVERAGE SPEED =80 + 30/2

=>55m/s

Answer:

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Answer:

bro this station is not of Physics this is of CHEMISTRY and what you have written this is wrong its means that you are reacting the metal with carbonate that is also wrong right metal carbonate and MAIN thing is is that you need to do not you need not to write it is also reacting with metal hydrocarbonate this is old so wrong this equation will be the acid reacts with CARBON at or metal hydrogen carbonate and it its formula will be acid + metal carbonate or metal hydrocarbonate is equal to Salt + MI hydro WATER + mein carbon dioxide

Answer:

A

3.06m/s

2

and 11.4s

Given,

Velocity of car V=126 km/h=35 m/s

Displacement s=200 m

Final velocity v=0 m/s

Apply SECOND kinematic equation to calculate retardation a

v

2

−u

2

=2as

⇒a=

2s

v

2

−u

2

=

2×200

0−35

2

=−3.0625 m/s

2

Apply FIRST kinematic equation to calculate time t

v=u+at

⇒t=

a

v−u

=

3.0625

0−35

=11.43 sec

HENCE, retardation is 3.06 m/s

2

and time take to stop is 11.4 sec

ANSWER:

खाद एक "प्राकृतिक जैविक" नाइट्रोजन उर्वरक है. यह सब्जी के बागानों में मिट्टी के लिए काफी अच्छा माना जाता है, खासकर "हरी" फसलों के लिए, जैसे कि लेट्यूस, केला, ब्रोकोली, खीरे, आदि. अगर बात करें उर्वरक कि तो आप इसे आराम से स्टोर से खरीद सकते हैं, जोकि बक्से या फिर बैग में बेचा जाता है. लेकिन अभी भी ज़्यादातर लोग खाद और उर्वरक में सही से अंतर नहीं जान पाए हैं. ऐसे में आज हम आपको अपने इस लेख में इन दोनों के बीच के विशेष अंतरों के बारे में विस्तार से बताते है.

Explanation:

diameter= 20m

since the diameter is 20m the DISPLACEMENT will also be 20. (displacement is the shortest path between INITIAL and final point)

to FIND circumference (that is distance) formula is pi x d

to find semicircle circumference is d+ pi R

1. round 1 = 20m ; 62.8m

2.round 1.5= 20m ; 31.4 + 62.8= 94.2m

3.round 2= 20m ; (62.8 x 2) 125.6m

4. round 2.5= 20m ; 157m

Answer:

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Explanation:

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The RESISTANCE of a conductor DEPENDS on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is IMPORTANT to note that electrical conductivity and resistivity are inversely PROPORTIONAL, meaning that the more conductive something is the less RESISTIVE it is.

Answer:

it will be when acid react with carbonate or METAL carbonate it will produce salt + WATER + CARBON DIOXIDE

ANSWER:

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