Enough to raise 550 pounds of the horse 1 foot high. That is 555 foot pounds. Electrically it takes 746 watts of power
i think that it 2.5 gas that make up 1 gallon
Very little. Basically just the metabolic energy due to the time necessary to do it. You usually do not have to change the potental energy of mach mass (lift heavy things) to "produce" homework.
21 pounds.
Usually between 0.75-50 Mega Watts (MW)
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