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22 February, 11:55

If the same amount of work needed to keep a 100W light bulb lit for one hour could be used to lift a 2000 kg SUV, what height could it be lifted to?

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  1. 22 February, 12:18
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    (100 watts) = 100 joules/second

    (100 joules/second) x (3,600sec/hour) = 360,000 joules/hour

    360,000 joules = 360,000 newton-meters

    Weight of 2,000 kg on Earth = (2,000 kg) x (9.8 m/s²) = 19,600 newtons

    (360,000 newton-meters) / (19,600 newtons) = 18.4 meters off the ground
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