What electromagnetic waves are used in these applications?
Diagnosing illnesses:
Warming and cooking food:
Transmitting data from remote controls to televisions:

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

How would a small bar magnet be oriented when placed at position x?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.