- 1(current)
Q. No.A mass of \(5~\text {kg}\) is moving along a circular path of radius \(1~\text {m}\). If the mas moves with \(300~\text {rev/min}\), its kinetic energy would be
1. \(250 \pi^2~\text{J}\)
2. \(100 \pi^2~\text{J}\)
3. \(5 \pi^2~\text{J}\)
4. \(0\)
Subtopic: Â Concept of Work |
 73%
Level 2: 60%+
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Which of the diagrams in the figure correctly shows the change in kinetic energy of an iron sphere falling freely in a lake with sufficient density to impart it a terminal velocity?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Concept of Work |Â Work Energy Theorem |
 72%
Level 2: 60%+
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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) |
Subtopic: Â Concept of Work |Â Work Energy Theorem |
Level 3: 35%-60%
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A proton is kept at rest. A positively charged particle is released from rest at a distance \(d\) in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. At the same time \(t\), the work done on the two moving charged particles is:
| 1. | same as the same force law is involved in the two experiments. |
| 2. | less for the case of a positron, as the positron moves away more rapidly and the force on it weakens. |
| 3. | more for the case of a positron, as the positron moves away from a larger distance. |
| 4. | same as the work done by charged particle on the stationary proton. |
Subtopic: Â Concept of Work |
Level 3: 35%-60%
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A man squatting on the ground gets straight up and stands. The force of reaction of the ground on the man during the process is
| 1. | constant and equal to mg in magnitude. |
| 2. | constant and greater than mg in magnitude. |
| 3. | variable but always greater than mg. |
| 4. | at first, greater than mg and later becomes equal to mg. |
Subtopic: Â Concept of Work |
 52%
Level 3: 35%-60%
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A mass of 5 kg is moving along a circular path of radius 1 m. If the mass moves with 300 revolutions per minute, its kinetic energy would be
1. \(250 \pi^2\)
2. \(100 \pi^2\)
3. \(5 \pi^2\)
4. 0
1. \(250 \pi^2\)
2. \(100 \pi^2\)
3. \(5 \pi^2\)
4. 0
Subtopic: Â Concept of Work |
 89%
Level 1: 80%+
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