A ball dropped from height of 4.00m makes a perfectly elastic collision with the ground. Assuming no mechanical energy is lost due to air resistance: (a) Show that the ensuing motion is periodic
(b) Determine the period of the motion
(c) Is the motion simple harmonic? Explain.

When you turn on a battery-operated device, an electrical circuit is

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

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.