A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 29 degrees, the crate begins to slide downward.

Question

A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 29 degrees, the crate begins to slide downward. 
What is the coefficient of static friction between the crate and the ramp? 
At what angle does the crate begin to slide if its mass is doubled?

bobpursley · Accepted Answer

http://answers.yahoo.com/question/index?qid=20080217210614AAo9qF6

Anonymous · Answer

need help

Anonymous · Answer

Coefficient of static friction = 0.4877