A block of mass 2 kg moving with a velocity of 10 m/s on a smooth surface hits a spring of force constant N/m as shown. The maximum compression in the spring will be:
1. | 5 cm | 2. | 10 cm |
3. | 15 cm | 4. | 20 cm |
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A body is displaced from (0, 0) to (1m, 1m) along the path x=y by a force . The work done by this force will be :
1.
2.
3.
4.
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A block of mass m initially at rest, is dropped from a height h onto a spring of force constant k. If the maximum compression in the spring is x, then:
1.
2.
3.
4.
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1. | no work is done by the tangential force. |
2. | no work is done by the centripetal force. |
3. | work done by the tangential force is always positive. |
4. | work done by the centripetal force is negative. |
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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
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A weight 'mg' is suspended from a spring. The energy stored in the spring is U. The elongation in the spring is:
1.
2.
3.
4.
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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 )
1. 50 J
2. 100 J
3. 25 J
4. Zero
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A block is carried slowly up an inclined plane. If is work done by the friction, is work done by the reaction force, is work done by the gravitational force and is the work done by an external force, then choose the correct relation(s):
1.
2. = 0
3.
4. All of these
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The principle of conservation of energy implies that:
1. the total mechanical energy is conserved.
2. the total kinetic energy is conserved.
3. the total potential energy is conserved.
4. the sum of all types of energies is conserved.
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The potential energy \(\mathrm{U}\) of a system is given by (where \(\mathrm{x}\) is the position of its particle and \(\mathrm{A},\) \(\mathrm{B}\) are constants). The magnitude of the force acting on the particle is:
1. constant
2. proportional to \(\mathrm{x}\)
3. proportional to
4. proportional to
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