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September 17, 2014

September 17, 2014

Posted by **Unknown** on Monday, June 16, 2014 at 9:04pm.

a) find the power

b) if the motor is only 35% efficient find the input energy

- Physics -
**Damon**, Monday, June 16, 2014 at 9:15pmchange in potential energy = m g h = 12 * 9.81 * 15 = 1766 Joules

power = joules per second = 1766/3.5 =505 Watts

Input power = 505/.15 = 3363 Watts

Input energy = 3363 Watts * 15 seconds = 50,451 Joules

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