a block rests on a horizontal surface the normal force is 20N and the coefficient of static friction between the Block and the surface is 0.40 and the coefficient dynamic friction is 0.20 what is the magnitude of the frictional force exerted on the Block what block is at the rest​

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?