The graph shows the variation with force F of the extension s of a spring The

The graph shows the variation with force f of the

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7.The graph shows the variation with force F of the extension s of a spring.The work done in changing the extension of the spring from 3.0 cm to 6.0 cm is A.15 N cm.B.30 N cm.C.45 N cm.D.60 N cm. 10.Two objects undergo an inelastic collision. Which of the following is correct in respect of both the conservation of momentum and the conservation of total energy of the system?MomentumTotal energy 12.Which of the following is a correct definition of work? 14. A ball is thrown vertically upwards and comes down again. Air resistance is negligible. Which of the following graphs shows how the gravitational potential energy E P varies with time t ? 12
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15.A pump extracts water from a well of depth h at a constant rate of R kg s–1. What is the power required to raise the water? R Rg hg 19.A railway engine of mass mmoves along a horizontal track with uniform speed v. The total resistive forceacting on the engine is F.Which of the following is the power of the engine? A.mvB.FvC.FD.F F mv v 23.A lift (elevator) is operated by an electric motor. It moves between the 10th floor and the 2nd floor at a constant speed. One main energy transformation during this journey is 26. A constant force acts on a mass that is initially at rest. Which of the following graphs best shows how the kinetic energy E K of the mass changes with the work W done on the mass? Friction is negligible. 13
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29.For a particle moving at constant speed in a horizontal circle, the work done by the centripetal force is 30.A vehicle is driven up a hill at constant speed. Which of the following best describes the energy changes involved? 14
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