The average distance from earth to the sun is equal to one

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

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

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?