Q. 48

Expert-verified
Found in: Page 258

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# Sam, whose mass is , straps on his skis and starts down a -m-high, frictionless slope. A strong headwind exerts a horizontal force of N on him as he skies. Use work and energy to find Sam’s speed at the bottom.

Sam's speed at the bottom of the slope is

See the step by step solution

## Step 1: Given information

Sam, whose mass is straps on his skis and starts down a high, frictionless slope. A strong head wind exerts a horizontal force of on him as he skies.

## Step 2:Explnation

Potential energy of a mass at height h is taken as mgh. KE of an object moving with velocity

The component along the slope of the wind force acting on Sam is

Work done by the wind on Sam is

The KE of Sam at the bottom is

The other component (component perpendicular to the slope) of the wind force does no work as the friction between the skis and slope is zero.