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Assertion : The work done by the electrostatic force is zero when a point charge moves in a circular path around another charge.
Reason : The dot product of force and displacement vectors gives work done.
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Important Questions on Work, Energy and Power
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A body of mass , under the action of a force, is displaced according to the equation where is the time. Find the work done by the force in the first seconds.
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When a force acts on a body of mass and displaces it from to , the work done is
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A uniform chain of mass and length is lying on a smooth horizontal table, with half of its length hanging down. The work done in pulling the entire chain up the table is
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A body is released from a height of vertically downwards. The speed of the body at which potential energy is twice that of kinetic energy is (Acceleration due to gravity )
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A particle is released from a height . At a certain height its kinetic energy is half of its potential energy with reference to the surface of the earth. Height and speed of the particle at that instant are respectively
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A particle is kept on the surface of a uniform sphere of mass and radius . The work done per unit mass against the gravitational force between them is
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A sphere of mass is attached to a spring of spring constant and is held in unstretched position over an inclined plane as shown in the figure. After letting the sphere go, find the maximum length by which the spring extends, given the sphere only rolls.
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A uniform chain has a mass ' ' and length '. It is held on a frictionless table with one-sisth of its length hanging over the edge. The work done in just pulling the hanging part back on the table is:
