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A weight lifter lifts 150 kg to a height of 2 m in 10 seconds What is the power used Remember the force of an objects weight equals mass x gravity?
We're not given the weight of the dumb-bell, but the weight of the load he lifts is (150 x 9.8) = 1,470 newtons.
The potential energy gained by the weight through a rise of 2 meters is
(m g h2) - (m g h1) = (m g) (h2 - h1) = (150 x 9.8 x 2) joules
The power is the rate at which the potential energy increases = (150 x 9.8 x 2) / 2
= 1,470 joules per second = 1,470 watts(rounded)
= about 1.97 horsepower !
What else can I help you with?
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