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The diagram shows a barrel of weight on a frictionless slope inclined at to the horizontal.

The force is parallel to the slope. Whet is the work done in moving the barrel a distance of up the slope?

(a)
(b)
(c)
(d)

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Important Questions on Work, Energy and Power
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A mass lying on a table is displaced in the horizontal direction through The work done by the normal reaction will be

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A pump on the ground floor of a building can pump up water to fill the tank of in min. If the tank is above the ground, and the efficiency of the pump is the power consumed by the pump is
