The human body has a mechanical energy efficiency of about 0.25. (a) How much chemical energy...

The human body has a mechanical energy efficiency of about 0.25.

(a) How much chemical energy is needed to lift a 3 kg weight up from the ground to a height of 1.6 meters?

(b) How much thermal energy is produced while the weight is lifted?

(c) If the weight is released after being lifted, how much kinetic energy will it have just before it hits the ground?

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The human body has a mechanical energy efficiency of about 0.25. (a) How much chemical energy...

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