Paragraph: A wheel of a car is made up of two parts (1)the central metal rim, and (2)the rubber tyre. The width of the tyre W=16.5 ~cm and height h=10.7 ~cm . The rim overlaps the tyre. The total weight of the car is 1500 kg distributed evenly. The tyres are inflated with air to a pressure 2.0 ~kg / cm ^2 . The density of air at pressure of 1.0 ~kg / cm ^2 and at room temperature equals 1.29 g /litre. The outer diame