a 4.00-kg block rests on a 30.0° incline as shown in the figure. if the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force f must act on the block to start it moving up the incline?

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.