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April 21, 2014

Homework Help: Physics - Verification

Posted by Raf on Monday, February 6, 2012 at 7:40pm.

A skier (75 kg) goes down a 15* slope. The coefficient of kinetic friction between the skis and the snow is 0.185. The length of the slope is of 500m.

a) What is the work done by gravity?

Answer) Wmg = mgd

= 75kg(9.8N/kg)500m(sin15)
= 354 977 J

Is it cos or sin? And is Work done by both air and friction supposed to be higher than work done by gravity at the end of the slope?

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