1) Calculate the centripetal force acting on a 925 kg car as it rounds an unbanked curve with a radius of 75 m at a speed of 22 m/s. 2) A car with a mass of 833 kg rounds an unbanked curve in the road at a speed of 28.0 m/s. If the radius of the curve is 105 m, what is the average centripetal force exerted on the car?

3) An amusement park ride has a radius of 2.8 m. If the time of one revolution of a rider is 0.98 s, what is the speed of the rider?

4) An electron (m=9.11x10 -31kg) moves in a circle whose radius is 2.00 x 10 -2m. If the force acting on the electron is 4.60x10 -14N, what is its speed?

5) A 2.7x10 3kg satellite orbits the Earth at a distance of 1.8x10 7m from the Earth’s centre at a speed of 4.7x10 3m/s. What force does the Earth exert on the satellite?

6) A string can withstand a force of 135 N before breaking. A 2.0 kg mass is tied to the string and whirled in a horizontal circle with a radius of 1.10 m. What is the maximum speed that the mass can be whirled at before the string breaks?

7) A motocross rider at the peak of his jump has a speed such that his centripetal acceleration is equal to g. As a result, he does not feel any supporting force from the seat of his bike, which is also accelerating at rate g. Therefore, he feels if there is ni force of gravity on him, a condition described as apparent weightlessness. If the radius of the approximately circular jump is 75.0 m, what is the speed of the bike?