A 200-kg block is slowly pushed a distance of 80 m up a slope that makes an angle of 30° with the horizontal. Determine the work done by a horizontally applied force P if the coefficient of friction...

A 200-kg block is slowly pushed a distance of 80 m up a slope that makes an angle of 30° with the horizontal. Determine the work done by a horizontally applied force P if the coefficient of friction is 0.3.

A spring is 8 in. long when loaded with 15 lb and 6.5 in. long when loaded with 25 lb. Determine the spring constant.