The tires of a car are inflated to 30psi before driving, at a temp of 77 F. During moderate driving on city streets, the tires heat to a temp of 100F.
a. assuming an isentropic process, what is the pressure inside the tires while driving, assuming they are filled with i)air, and ii) diatomic nitrogen (N2)?
b. If the tire is filled with air and the final pressure after heating to 100F is actually 32 psi, calculate the change in entropy per unit mass.