A76.5 kg cross-country skier skiing on unwaxed skis along dry snow at a constant speed of 4.00 m/s experiences a force of friction of -60.0 n. what is the coefficient of friction between unwaxed skis and dry snow?
a. 0.08
b. 0.78
c. 1.28
d. 12.5

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not