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Work, Energy an...

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  • Question 1
    4 / -1

    Assertion : Both, a stretched spring and a compressed spring have potential energy.
    Reason : Work is done against the restoring force in each case.

  • Question 2
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    A body falls freely under the action of gravity from a height h above the ground.

  • Question 3
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    A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction (g = 10 m / s2)

  • Question 4
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    . If the unit of force and length each be increased by four times, then the unit of energy is increased by

  • Question 5
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    A man pushes a wall and fails to displace it. He does

  • Question 6
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    Which of the following is a scalar quantity

  • Question 7
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    A force of 5N acts on a 15kg body initially at rest. The work done by the force during the first second of motion of the body is

  • Question 8
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    The work done against gravity in taking 10 kg mass at 1m height in 1 sec will b e

  • Question 9
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    The slope of the kinetic energy versus position vector gives the rate of change of

  • Question 10
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    A 50kg man with 20kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

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