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A 200 kg object and a 500 kg object are separated by 1.2 m. A 150 kg object is placed half way between the two objects.
(a) What is the gravitational potential energy of the three masses?
(b) How much work would be required to move the 150 kg object so that it is only 0.2 m from the 200 kg object?
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When a 5.5 cm long pencil is arranged perpendicular to a convex mirror's optical axis at a distance of 29 cm from the mirror, its image is 2.8 cm tall.
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The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain by the block and tackle pulley system. What is the work done..
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