What is the gravitational energy of stone-earth, Ask an Expert

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Question1

How much 235U is consumed per year (in g/y) to produce sufficient electricity to continuously run a 100-W light bulb? How much coal (in g/y) would be essential (coal has a heat content of about 12 GJ/tom)? Assume a conversion efficiency of 33 percent of thermal energy into electrical energy.

Question2

A 0.20 kg stone is held 1.3m above the top edge of water well and then dropped into it. The well has a depth of 5.0m. Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth System?

(a) Before the stone is released and

(b) When it reaches bottom of the well?

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