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Work, Energy an...

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  • Question 1
    4 / -1

    A rock weighing 50 N falls from a height of 10 m and sinks 0.5 m into the ground. From energy consideration, the average force f between the rock and the ground as the rock sinks is :

  • Question 2
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    The vessels A and B of equal volume and weight are immersed in water to depth h. The vessel A has an opening at the bottom through which water can enter. If the work done in immersing A and B are WA and WB respectively, then:

  • Question 3
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    A block of mass 0.5 kg has an initial velocity of 10m/s down an inclined plane of angle 300, the coefficient of friction between the block and the inclined surface is 0.2. The velocity of the block after it travels a distance of 10 m is

  • Question 4
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    An object of mass m is tied to a string of length l and a variable horizontal force is applied on it , which starts at zero and gradually increases (it is pulled extremely slowly so that quilibrium exists at all times) until the string makes an angle Ө with the vertical. Work done by the force F is

  • Question 5
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    A stone of mass m kg is whirled in a vertical circle of radius 20 cm .The difference of the kinetic energies at the lowest and the topmost position is :

  • Question 6
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    A ball is allowed to fall down with initial speed v from a height of 10 m. It loses 50 % kinetic energy after striking the floor. It reaches to the same height after collision.What is the value of v ?

  • Question 7
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    A mass of 2 kg rests on an inclined plane of gradient 1 in 8 as shown in fig. The work done in sliding it from the lowest point of the incline to the highest point, if the coefficient of friction is 0.2, is :

  • Question 8
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    A small body is projected in a direction inclined at 45º to the horizontal with kinetic energy K. At the top of its flight, its kinetic energy will be:

  • Question 9
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    Two springs have their force constants k1 and k2. These are extended through the same distance x. If their elastic energies are E1 and E2, then E1 : E2 will be :

  • Question 10
    4 / -1

    A compressor A compresses one litre of air from a pressure of 1atmosphere to a pressure of 3 atmosphere and does work WA . But compressor B compresses one litre of water from a pressure of one atmosphere to three atmosphere and does work WB, then

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