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. | 4Ļ2lT24Ļ2lT2 | 2. | 4Ļ23lT24Ļ23lT2 |
3. | 8Ļ23lT28Ļ23lT2 | 4. | 12Ļ2lT212Ļ2lT2 |
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A particle moves in the x-y plane according to the equation
x=Acos2Ļtx=Acos2Ļt and y=Asin2Ļty=Asin2Ļt
Then, the particle undergoes:
1. | x+y=Ax+y=A | uniform motion along the line
2. | x2+y2=A2x2+y2=A2 | uniform circular motion along
3. | x+y=Ax+y=A | SHM along the line
4. | x2+y2=A2x2+y2=A2 | SHM along the circle
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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. |
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The equation of motion of a particle that starts moving at t=0t=0 s is given by x=5sin(Ļt2+Ļ3)x=5sin(Ļt2+Ļ3) 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 |
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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. | 2Ļāmk2Ļāmk |
2. | Ļāmk+lā2mEĻāmk+lā2mE |
3. | 2Ļāmk+2lā2mE2Ļāmk+2lā2mE |
4. | Ļāmk+lām2EĻāmk+lām2E |
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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 |
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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. |
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1. | the amplitude increases. |
2. | the amplitude decreases. |
3. | the frequency increases. |
4. | the frequency decreases. |
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1. | 2ĻāLg | 2. | 2Ļā2Lg |
3. | 2ĻāL2g | 4. | 2Ļā2Lā3g |
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1. | T | 2. | ĻT |
3. | Ļā2T | 4. | Ļā2T |
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