The farmer uses a force F1 = 59 N to pull the bucket of water directly upwards. The total mass of the bucket of water is mb + mw = 3.7 kg.
Calculate how much work Wf in J the farmer does on the bucket of water (via the rope) to raise it to ground level.
Calculate how much work Wg in J gravity does on the bucket filled with water as the farmer lifts it up the well.
Calculate the net work Wnet in J done on the bucket of water by the two forces F1 and Fg.
Ch5 (2)
1 Answer
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(3.5kg x g) = 36.26N. (9.8 used for g).
Work done by farmer = (fd) = 59 x 11 = Wf of 649 Joules.
Work done by gravity = (36.26 x 11) = Wg of 398.86 Joules.
Net work done = (649 – 398.86) = 250.14 Joules.
