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The work done in slowly pulling up a block of wood weighing 2 kN for a length of 10 m on a smooth plane inclined at an angle of 15º with the horizontal by a force parallel to the incline is

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Important Questions on Work, Energy and Power

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 8
Two equal masses are attached to the two ends of a spring of spring constant k. The masses are pulled out symmetrically to stretch the spring by a length x over its natural length. The work done by the spring on each mass is
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 9
A particle is dropped from a height h. A constant horizontal velocity is given to the particle. Taking g to be constant everywhere, kinetic energy E of the particle w. r. t. time t is correctly shown in
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 10
A body moving at 2 m s-1 can be stopped over a distance x. If its kinetic energy is doubled, how long will it go before coming to rest, if the retarding force remains unchanged?
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 11
A rod of length 1 m and mass 0.5 kg hinged at one end is initially hanging vertically. The other end is now raised slowly until it makes an angle 60ºwith the vertical. The required work is : (use g= 10 m s-2)
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 13
A small mass slides down an inclined plane of inclination θ with the horizontal. The coefficient of friction is μ=μox, where x is the distance through which the mass slides down and μo a positive constant. Then the distance covered by the mass before it stops is
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 14

A toy car of mass 5 kg starts from rest and moves up a ramp under the influence of force F(F is applied in the direction of velocity) plotted against displacement x. The maximum height attained is given by

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 15

____________ of a two particle system depends only on the separation between the two particles.

The most appropriate choice for the blank space in the above sentence is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 16

A block of mass $m$ is attached to two unstretched springs of spring constants k1 and k2 as shown in figure. The block is displaced towards right through a distance x and is released. Find the speed of the block as it passes through the mean position shown.

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