Question

A 63 kg object needs to be lifted 7 meters in a matter of 5 seconds. Approximately how much horsepower is required to achieve this task?

Answer 1

88.1 watt is required to achieve this task

Answer 2

Mass, m = 63 kg
h = 7m
g = 9.8 m/s^2

Energy needed to lift it to 7m height = mgh = 63×9.8×7 = 4321.8 J

Time to lift = 5s

Power = W/t = 4321.8/5 = 864.36 Watt

1 hp = 746 watt

864.36 watt = 864.36/746 hp = 1.16 hp


Power needed is 1.16 hp