1. A car is safely negotiating an unbanked circular turn at a speed of 20 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-fourth of its dry-road value. If the car is to continue safely around the curve, to what speed must the driver slow the car?
_______________m/s
2. What is the average linear speed of Jupiter about the Sun? (The distance from the Sun to Jupiter is 7.78 1011 meters. The orbital period around the Sun is 4332.7 days.)
_______________m/s