How much farther from the sun is the orbit of Neptune than the orbit of Earth? (Hint: Subtract Earth’s average distance from the sun from Neptune’s average distance from the sun.)

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.