What is the purpose of a rearview mirror in a car?

the mirror allows the light to be absorbed so the driver will not see any glare.
the mirror allows the light to interfere so the light waves combine to form an image.
the mirror allows the light to be reflected so the objects behind the car can be seen.
the mirror allows the light to be transmitted so the light will not reach the driver's eyes.

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?

How can waves travel through ground?