Answer to Question #326263 in Mechanics | Relativity for Anonymous005

Question

A box rests on a surface that is lifted by one end to create a larger and larger angle with the horizontal. When the surface reaches an angle of exactly 30 degrees with the horizontal, the box begins to slide down. What is the coefficient of static friction?

a)  μs = 1/√ 3

b)  μs = 2/√ 3

c)  μs = √ 3

d)  μs = 0.5

Answer 1

$\mu_s=\arctan30°=\frac 1 {\sqrt 3}.$