A uniform chain of length \(L\) and mass \(M\) is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If \(g\) is acceleration due to gravity, the work required to pull the hanging part on the table is:

1. \(MgL\)

2. \(MgL/3\)

3. \(MgL/9\)

4. \(MgL/18\)

Subtopic:  Gravitational Potential Energy |
 73%
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The work done by a person in carrying a box of mass 10 kg to a vertical height of 10 m is 4900 J. The mass of the person is:

1.  40 kg

2.  60 kg

3.  50 kg

4.  55 kg

Subtopic:  Gravitational Potential Energy |
 69%
From NCERT
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In the given figure, a man pulls the mass m with the help of a rope. Work done by the man against gravity when mass is lifted by 0.5 m is: (g = 10 m/s2)

     
1. 50 J
2. 100 J
3. 25 J
4. Zero

Subtopic:  Gravitational Potential Energy |
 62%
From NCERT
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A particle of mass 'm' is projected at an angle 'α' with the horizontal, with an initial velocity 'u'. The work done by gravity during the time it reaches its highest point is:

1. u2sin2a

2. mu2cos2α2

3. mu2sin2α2

4. -mu2sin2α2

Subtopic:  Gravitational Potential Energy |
 60%
From NCERT
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What is the work done by gravity on block A in 2 seconds after the blocks are released? (Pulley is light)

              

1.  240 J

2.  200 J

3.  120 J

4.  24 J

Subtopic:  Gravitational Potential Energy |
 61%
From NCERT
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A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down at a uniform speed of 7 m/s. It hits the floor of the elevator (length of the elevator = 3 m) and does not rebound. What is the heat produced by the impact?

1.  8.82 J

2.  7.65 J

3.  7.01 J

4.  7.98 J

Subtopic:  Gravitational Potential Energy |
 59%
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Select the incorrect statement about potential energy:

1. A change in potential energy is equal to work done against the internal conservative force.

2. A change in potential energy is independent of the reference point.

3. A change in potential energy depends on the reference frame.

4. The potential energy at a point is not unique.

Subtopic:  Gravitational Potential Energy |
From NCERT
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