Which form of energy listed below is the most useful?
(a) 1000 J of thermal energy in very hot gas in a cylinder closed by a moveable piston
(b) 1000 J of thermal energy in cold gas in a cylinder closed by a moveable piston
(c) 1000 J of thermal energy in water at 15 °C in the rocks at the bottom of a waterfall
(d) 1000 J of thermal energy in the water in a boiler at 700 °C
(e) 1000 J of chemical energy stored in the chemical bonds of a piece of wood
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