As an electron moves, what does it make or cause ?
a) an aurora
b) ferromagnetism
c) an electromagnet
d) a magnetic field

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Athermometer is removed from a room where the temperature is 70° f and is taken outside, where the air temperature is 10° f. after one-half minute the thermometer reads 60° f. what is the reading of the thermometer at t = 1 min? (round your answer to two decimal places.) ° f how long will it take for the thermometer to reach 30° f? (round your answer to two decimal places.)

What is a carrier wave and how does it affect what you hear on the radio