Homework Help: Physics

Posted by smh on Sunday, March 18, 2012 at 12:19pm.

A skier starts from rest at the top of a hill that is inclined at 12.0° with the horizontal. The hillside is 180.0 m long, and the coefficient of friction between the snow and the skis is 0.0750. At the bottom of the hill, the snow is level and the coefficient of friction is unchanged. How far does the skier move along the horizontal portion of the snow before coming to rest?

I kniw the answer is 323m but I don't understand how to get there!

Physics - Elena, Sunday, March 18, 2012 at 3:48pm
The friction force during the motion along the inclined plane is
F(fr)1 = kN = k•m•g•cosα.
The work of this force is
W1= k•m•g•cosα•s.
The law of conservation of energy gives
PE=KE+W1,
m•g•h = m•v^2/2 + k•m•g•cosα•s.
m•v^2/2 = m•g•h - k•m•g•cosα•s.
For the motion along the horizontal path
KE=W2,
m•v^2/2 = k•m•g•s1
s1= m•v^2/2• k•m•g

Answer this Question

Related Questions

Physics - A skier starts from rest at the top of a hill that is inclined at 9.8&...
physics - A skier starts from rest at the top of a hill that is inclined at 9.5&...
physics - A skier starts from rest at the top of a hill that is inclined at 9.5&...
physics - A skier starts from rest at the top of a hill that is inclined at 10.3...
physics...again :/ - A skier starts from rest at the top of a hill that is ...
physics - A skier starts from rest at the top of a hill that is inclined at 11.0...
physics - A skier starts from rest at the top of a hill that is inclined 18.5&...
physics - a 75.0 kilogram skier is at the top of a hill that is thirty degrees ...
physics - A skier starts from rest at the top of a hill. The skier coasts down ...
Physics - A skier starts from rest at the top of a hill. The skier coasts down ...

For Further Reading

First Name:
School Subject:
Answer: