An object of weight 24 N rests on a rough plane inclined at 30" to the horizontal and is held by the tension in a string parallel to the plane. Determine the tension in the string if the coefficient...

An object of weight 24 N rests on a rough plane inclined at 30" to the horizontal and is held by the tension in a string parallel to the plane. Determine the tension in the string if the coefficient of friction is 0.2.

An object of mass 60 kg is at rest on a rough plane which is inclined at 45" to the horizontal. Determine the force needed to maintain the object at rest if the force is applied (a) parallel to the plane, (b) horizontally. The coefficient of friction is 0.25.