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A uniform rod of length ll is suspended by an end and is made to undergo small oscillations. The time period of small oscillation is TT. Then, the acceleration due to gravity at this place is:

1. 4Ļ€2lT24Ļ€2lT2 2. 4Ļ€23lT24Ļ€23lT2
3. 8Ļ€23lT28Ļ€23lT2 4. 12Ļ€2lT212Ļ€2lT2

Subtopic:  Angular SHM |
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A particle moves in the x-y plane according to the equation
       x=Acos2Ļ‰tx=Acos2Ļ‰t and y=Asin2Ļ‰ty=Asin2Ļ‰t
Then, the particle undergoes:

1. uniform motion along the line x+y=Ax+y=A
2. uniform circular motion along x2+y2=A2x2+y2=A2
3. SHM along the line x+y=Ax+y=A
4. SHM along the circle x2+y2=A2x2+y2=A2
Subtopic:  Linear SHM |
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A particle of mass mm executes SHM along a straight line with an amplitude AA and frequency f.f.

Assertion (A): The kinetic energy of the particle undergoes oscillation with a frequency 2f.2f.
Reason (R): Velocity of the particle, v=dxdtv=dxdt, its kinetic energy equals 12mv212mv2 and the particle oscillates sinusoidally with a frequency ff.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Energy of SHM |
 52%
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The equation of motion of a particle that starts moving at t=0t=0 s is given by x=5sin(Ļ€t2+Ļ€3)x=5sin(Ļ€t2+Ļ€3) where xx is in cm and time tt is in second. The time, when the particle first comes to rest, is:

1. 1313 s 2. 7676 s
3. 2323 s 4. 136136 s
Subtopic:  Linear SHM |
 63%
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The energy of the block is EE, and the plane is smooth, the wall at the end BB is smooth. Collisions with walls are elastic. The distance AB=lAB=l, the spring is ideal and the spring constant is kk. The time period of the motion is:
    

1. 2Ļ€āˆšmk2Ļ€āˆšmk
2. Ļ€āˆšmk+lāˆš2mEĻ€āˆšmk+lāˆš2mE
3. 2Ļ€āˆšmk+2lāˆš2mE2Ļ€āˆšmk+2lāˆš2mE
4. Ļ€āˆšmk+lāˆšm2EĻ€āˆšmk+lāˆšm2E
Subtopic:  Spring mass system |
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A simple pendulum of time period T0T0 is taken in a rocket which is accelerating upwards initially and then, after some time, it moves with uniform velocity upward. The time period of the pendulum is observed within the rocket and is found to be 2T02T0. The rocket, at that time, must be at a distance (above the earth's surface) of (radius of earth = RR)

1. R2R2 2. R4R4
3. RR 4. 4R4R
Subtopic:  Angular SHM |
 58%
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Trains travel between station AA and station BB: on the way up (from A to BA to B) - they travel at a speed of 80 km/h, while on the return trip the trains travel at twice that speed. The services are maintained round the clock. Trains leave station A every 30 min for station B and reach B in 2 hrs. All trains operate continuously, without any rest at A or B.

1. the frequency of trains leaving B must be twice as much as A.
2. the frequency of trains leaving B must be half as much as A.
3. the frequency of trains leaving B is equal to that at A.
4. the situation is impossible to maintain unless larger number of trains are provided at A.
Subtopic:  Types of Motion |
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A spring-mass system is undergoing horizontal oscillations on a frictionless surface. During the oscillation, the block picks up a particle, when it is at its extreme position. As a result of this,
1. the amplitude increases.
2. the amplitude decreases.
3. the frequency increases.
4. the frequency decreases.
Subtopic:  Spring mass system |
 56%
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Three particles of equal mass are connected by massless rods of length L to form an equilateral triangle, ABC. This triangle is pivoted at A and allowed to oscillate in its own plane. The time period of small oscillation is:
1. 2Ļ€āˆšLg 2. 2Ļ€āˆš2Lg
3. 2Ļ€āˆšL2g 4. 2Ļ€āˆš2Lāˆš3g
Subtopic:  Angular SHM |
 54%
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An elastic ball is projected vertically upward with a speed u, and it returns to the ground and rebounds, the motion is periodic with a period T. A simple pendulum, having a length equal to maximum altitude attained by this ball, would have a time period of:
1. T 2. Ļ€T
3. Ļ€āˆš2T 4. Ļ€āˆš2T
Subtopic:  Angular SHM |
 52%
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