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November 27, 2014

Homework Help: TOm

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

Hello, this is the last question that I can't seem to or be able to solve:

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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