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Work, Energy and Power
When a cracker explodes, how does this effect:
(a) its total kinetic energy?
(b) chemical energy ?
(a) When a cracker explodes, its fragments acquire kinetic energy. Initially, the cracker is at rest therefore, initial kinetic energy is zero. Hence, there is an increase in kinetic energy.
(b) Chemical energy decreases because total energy of system remains constant. Kinetic energy of the fragments is at the cost of chemical energy.
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By eating two apples, a person starts pushing the wall of room. If food value of apple is 100 calories per apple, how much work he will do in pushing the wall in one hour?
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