URGENT A ski that is placed on snow will stick to the snow. However, when the sk

Question

URGENT

A ski that is placed on snow will stick to the snow. However, when the ski is moved along the snow, the rubbing warms and partially melts the snow, reducing the coefficient of kinetic friction and promoting sliding. Waxing the ski makes it water repellent and reduces friction with the resulting layer of water. A magazine reports that a new type of plastic ski Is especially water repellent and that, on a gentle 210 m slope in the Alps, a skier reduced his top-to-bottom time from 61.0 s with standard skis to 44.0 s with the new skis. Determine the magnitude of his average acceleration with (a) the standard skis and (b) the new skis. Assuming a 3.00 degree slope, compute the coefficient of kinetic friction for (e) the standard skis and (d) the new skis. (a) Number Units (b) Number Units (c) Number Units (d) Number Units

Explanation / Answer

distance=210 m
acceleration in 1st case=2*210/61^2=0.1129 m/s^2

acceleration 2nd case=2*210/44^2=0.217 m/s^2

coefficient of kinetic friction for standard ski=(9.8-0.1129)/(9.8*cos(3))=0.98984

for improved ski=(9.8-0.217)/(9.8*cos(3))=0.9792

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