A block weighing 80 lbs is on a 32.2 degree plane....?

Question

Find:
(a)
The force parallel to the plane,
(b)
The acceleration if there is no friction,
(c)
The coefficient of friction if the object is just at the point of sliding,
(d)
The acceleration of the block if the coefficient of sliding friction is 0.280

Answer 1

I am too lazy to solve this, but i am sure if you lloked up force on an incline plane in wikipedia or google it will give you nearly the exact solution

Answer 2

http://en.wikipedia.org/wiki/Coefficient_of_friction