Problem involving friction, with a mass being pulled up a slope

[Helena Durrant]

Homework Statement

A block sits on a slope that has an angle of 10◦ to the horizontal. There is a coefficient of
static friction µs = 0.3 between the block and the slope. You apply a force to the block in
an attempt to pull it up the hill. Calculate the angle to the horizontal at which you should
apply this force to maximise your chances of being able to make the block move up the
hill

Relevant Equations

limiting static friction equation

(The answer from the markscheme is 26.7)

 

[Doc Al]

Interesting problem. Where's your attempt?