# Physics

a 70 kg hockey player moving at 8.0m/s stops quickly. how much ice melts due to the friction between the player's skates and the ice? assume that only 60% of the energy lost by the skater goes to melting the ice, and that the temperature of the ice is 0 degrees Celsius

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1. energy in stopping = 1/2 m v^2=1/2 *70*64=2240joules
energy in melting ice: 0.6* massice*333.6kj/kg

massice= 2.240*.6/333.6 kg = about 4 grams . check that

So if you had 1000 hockey players stopping on the ice, you would melt about 4 liters of ice. It wouldn't qualify as global warming.

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