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A 20 watt lightbulb uses 20 Joules of energy every second.A person expends 50 watts of energy per stair when climbing up stairs.How long could you light the lightbulb if the energy used to climb 20 stairs
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Sep 19, 2019
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A 20 watt lightbulb uses 20 Joules of energy every second.A person expends 50 watts of energy per stair when climbing up stairs.How long could you light the lightbulb if the energy used to climb 20 stairs were converted to electricity?
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20W = 20 J/s
Energy expended during climbing stairs = 50 W of energy/stair = 50J/stair
For 20 stairs, Total energy = 50x20 = 1000 J
This can light bulbs for, T= 1000J/20 J/s =50 seconds
Kedar Joshi
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Sep 25, 2019
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Kedar Joshi
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