If the universe had expanded at its original rate beyond the time when the strong nuclear force became a distinct force (about 10–35 s after the Big Bang), the isotropy problem would have arisen: Parts of the universe we see in opposite directions would never have been in equilibrium with each other and should not exhibit the degree of isotropy we observe. The proposed solution to this problem is .

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.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

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)