A60-kg woman stands on the very end of a uniform board, which is supported one-quarter of the way from one end and is balanced. what is the mass of the board?

a. 60 kg
b. 30 kg
c. 20 kg
d. 15 kg
e. 120 kg

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

15. one purpose of the tread pattern on a tire is to a reduce tire wear. b. reduce traction c. allow water to flow away from the tire. d. look impressive.

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid