1. An automobile with 0.300 m radius tires travels 85,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear? _______________revolutions
2. A truck with 0.590 m radius tires travels at 41.0 m/s. At how many radians per second are the tires rotating? What is this in rpm?
__________rads/s
__________rpm
3. A jet fighter flying at 300 m/s (just below the speed of sound) makes a turn of radius 2.30 km.
a) What is its centripetal acceleration in gs? _________g
b) Suppose the pilot makes an emergency turn to avoid an approaching missile, subjecting himself to a centripetal acceleration of 10 gs, while flying at 530 m/s (supersonic). What is the radius of his turn? (This must be short-lived because fighter planes can only briefly endure such large accelerations without serious damage, and the pilot will soon black out at 10 gs.) ___________km