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Work and Energy...

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  • Question 1
    1 / -0

    What is the angle between displacement and the force applied, when the work done is maximum?

  • Question 2
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    In the table given below energy transformations and different processes are listed. Match them.

    I. A water fall
    		 (i) Electric to mechanical
    II. Microphone
    		 (ii) Sound to electrical
    III. Loud speaker
    		 (iii) Potential to kinetic
    IV. Electric fan
    		 (iv) Electric to sound

  • Question 3
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    The unit kgm2s-2 is associated with

  • Question 4
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    A crane pulls up a car of mass 650 kg to a vertical height of 4 m. What is the work done by the crane?

  • Question 5
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    A force of 250 N on a block does a work of 2250 J. By how much length will the block be displaced?

  • Question 6
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    Two bodies of equal mass move with uniform velocities of V and 2V respectively. Find the ratio of their kinetic energies.

  • Question 7
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    A ball of mass 200 g falls from a height of 5 m. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/sec2)

  • Question 8
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    What is the work done by gravitational force when a body of mass 10 kg is dropped to the ground from a height of 10 meters?
    (Take g = 9.8 ms-2)

  • Question 9
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    The K.E. of a running man is half to that of a boy half his mass. The man speeds up by 1 m/s and then has the same K.E. as the boy. What were the original speeds of the man and the boy?

  • Question 10
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    A force `F` stops a body of mass `m` moving with a velocity `v` in a distance `s`, What is the force required to stop a body of double the mass moving with double the velocity in the same distance?

  • Question 11
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    When the K.E. of a body is increased by 300%, the momentum of the body is increased by

  • Question 12
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    An object A of mass 10 kg has a kinetic energy equal to 180 J. What will be its momentum?

  • Question 13
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    What is the kinetic energy of a body of mass 0.1 kg and momentum 20 kg m/s?

  • Question 14
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    The ratio of the magnitudes of the linear momentum of two blocks A and B is 1 :. What is the ratio of their kinetic energies?

  • Question 15
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    A body is dropped from a certain height above the ground. When it is half way down, it possesses

  • Question 16
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    At which position does a pendulum has the highest PE?

  • Question 17
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    If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?

  • Question 18
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    How much energy will an electric motor of 1 horse power consume in one second?

  • Question 19
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    If a force F is applied on a body and it moves with a velocity v, the power will be

  • Question 20
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    A motorboat is travelling with a speed of 7.0 m/s. If the force on it due to water fall is 600 N, what will be the power of the boat?

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