Thursday

August 21, 2014

August 21, 2014

Posted by **Physics** on Friday, January 27, 2012 at 3:37pm.

1. Jenny (75 kg) goes on a ski trip. She goes down a slope that's inclined at 15*. The drag coefficient of Jenny is 0.300, the surface of contact with air is 0.750 m^2 and the air density is 1,31 kg/m^3. The coefficient of kinetic friction between the skis and the snow is of 0,185.

Jennys speed according to her distance:

from 0 to 15m/s: between 0m and 50m

from 15 to 20 m/s: between 50m and 100m

constant 20m/s: 100m to 450m

from 20m/s to 0: 450m to 500m

Questions:

a) What is the Work done by the force of air resistance?

b) What is the Work done by the friction force between the skis and the snow?

c) What is the work of gravity?

d) What is the Power dissipated by the force of air resistance? What is the Power dissipated by the force of friction between the skis and the snow?

Thank you

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