EASY
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The diagram shows a barrel of weight 1.0×103 N on a frictionless slope inclined at 30° to the horizontal.

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The force is parallel to the slope. Whet is the work done in moving the barrel a distance of 5.0 m up the slope?

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Important Questions on Work, Energy and Power

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IMPORTANT
A 2 kg mass lying on a table is displaced in the horizontal direction through 50 cm. The work done by the normal reaction will be
HARD
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IMPORTANT
A pump on the ground floor of a building can pump up water to fill the tank of 30 m3 in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30%, the power consumed by the pump is g=10 m/s2