Suppose a box with a mass m is placed on an inclined surface. The coefficient of static friction between the
block and the surface is equal to µs. It is also known that the largest angle between the surface and the
horizontal at which the box does not start moving down is equal to θmax. Circle the letter that corresponds to
the correct relation between µs and θmax.
A. µs = sin () B. µs = cos () C. µ = tan−1
() D. µs
· tan () = 1