A heated iron is pressed against a shirt, warming it. This is an example of which of the following?
conduction, convection, radiation, all of the above

Which device uses ac current to operate?

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.