Consider the roller coaster on the track. if you want to increase the kinetic energy of the roller coaster as it proceeds through the course, what is the first thing you should do?
a) increase the height at point a.
b) decrease the height at point a.
c) increase the height at point b.
d) decrease the height at point b.

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.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

Observations show that interstellar clouds can have almost any shape and