When a wave traverses a medium, the displacement of a particle located at "x" at time "t" is given by y= a sin (bt-cx) where a, b and c are constants of the wave. the dimensions of b are the same as what?

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.