A 1.00 x 104 W electric motor is used to lift a 955 kg object vertically 25.0 m at a constant
velocity in 45.0 s. What is the efficiency of the
motor?

52%

Explanation:

1W = 1 J/s

motor input is 10000 J/s

Potential energy change

PE = 955(9.81)(25.0) = 234,213.75

power needed to change the PE in that time

P = 234,213.75/ 45 = 5,204.75 Watts

motor is 5204.75 / 10000 = 0.520475 or 52% efficient

a women have faced negative attitudes in some areas , but other

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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