Two cars are driving at the same speed. The cars have the same mass. One car is driving on an icy road. The other car is driving on a dry road. Which car will be able to stop more quickly? Explain your answer.

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.