A motorist stops at a service station located at sea level, where the atmospheric pressure is 101kPa. A hand-held tire gauge indicates that one of the car’s tires is inflated to 220kPa. The inner surface area of that tire’s tread and sidewall that encloses the air is estimated to be 0.30m2.
(a) Calculate the absolute pressure of the air inside the tire.
(b) Using your result from part (a), determine the magnitude of the outward force exerted by the air on the specified 0.30m2 portion of the tire’s interior surface.