If an object starts at rest and moves 90 meters south along a straight line for 3 seconds, what is its average velocity?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.