A crate slides down a ramp at a constant velocity. the ramp has an incline of 28 degrees above the horizontal the crate weighs 200 Newton's

First is the coefficient of static friction between the map

and the crate.

And the second one is at what angle does the crate begin to

slide if the mass is doubled.

1. To look for the coefficient of static friction:

ΣF = 0

μ x m x g x cos θ = m * g * sin θ

μ = sin θ / cos θ = tan θ

μ = tan 24 = 0.45

2. At what angle ... the solution is:

The static friction or μ does not depend

on mass, so the angle is still 24.