HELP AND HURRY PLZ I DONT HAVE MUCH TIMEEE

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?