- 1(current)
Q. No.
Which of the diagrams shown in the figure represents the variation of to mechanical energy of a pendulum oscillating in the air as a function of time.
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1. \(2.5~\text{J}\)
2. \(5.0~\text{J}\)
3. \(52.5~\text{J}\)
4. \(155.0~\text{J}\)
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A man of mass \(m,\) standing at the bottom of the staircase, of height \(L,\) climbs it and stands at its top.
| (a) | work done by all forces on man is equal to the rise in potential energy \(mgL.\) |
| (b) | work done by all forces on man is zero. |
| (c) | work done by the gravitational force on man is \(mgL.\) |
| (d) | the reaction force from a step does no work because the point of the application of the force does not move while the force exists. |
Choose the correct option from the given ones:
| 1. | (a), (d) | 2. | (a), (c) |
| 3. | (b), (d) | 4. | (a), (b), (c) |
A bullet of mass \(m\) fired at \(30^\circ\) to the horizontal leaves the barrel of the gun with a velocity \(v.\) The bullet hits a soft target at a height \(h\) above the ground while it is moving downward and emerge out with half the kinetic energy it had before hitting the target. Consider the following statements.
| (a) | the velocity of the bullet will be reduced to half its initial value. |
| (b) | the velocity of the bullet will be more than half of its earlier velocity. |
| (c) | the bullet will continue to move along the same parabolic path. |
| (d) | the bullet will move in a different parabolic path. |
| (e) | the bullet will fall vertically downward after hitting the target. |
| (f) | the internal energy of the particles of the target will increase. |
Which of the above-given statement(s) is/are correct in respect of the bullet after it emerges out of the target?
1. (a), (c), (f)
2. (a), (d), (f)
3. (b), (d, (f)
4. (a), (b), (c)
- 1(current)
Q. No.
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