# AP Physics help

amandamarie29
1. A tire of an automobile has a gauge pressure of 30 psi at the top of a mountain, and the air temperature inside the tire is 300K. The atmospheric pressure at the top of the mountain is 1.7 atm. The car is driven down to sea level, where the atmospheric pressure is 1.0 atm and the air inside the tire is heated to 350 K. At sea level, assuming no leaks, the gauge pressure of the tire will be:

A) lower.
B the same.
C) higher.

2. I put C. higher because the pressure increases when temperature increases. But that was wrong and i dont have a clue why...

## Answers and Replies

Staff Emeritus
Science Advisor
Homework Helper
Gold Member
Who makes up these problems?

Atmospheric pressure 1.7 atm @ top of a mountain and 1 atm @ Sea Level ? !!!

Staff Emeritus
Science Advisor
Homework Helper
Gold Member
Well, are you sure that atmospheric pressure at the top of the mountain isn't 0,7 atm, rather than 1.7 atm.

That would make a BIG difference.

amandamarie29
oh yes.. its 0.7 atm.. sorry typo =)