Questions 1-4: A 2-kg mass is moving in a circular path on the end of a 0.50-m string. The mass moves in a horizontal circle with a speed of 4.0 m/s. A 0.50m 12.0kg 1. The force exerted on the mass by the string is a. 8N b. 16 N C. 32 N d. 64 N

A boy takes a 1.5-kg rock and ties it to the end of a 0.80-m-long, massless, uniform rope. He then swings the rock in a vertical circle. If the speed of the rock at the bottom of the swing is 5.0 m/s, what is the tension in the rope? QUESTION 8 a. 52 N Ob.72 N OC. 57 N d. 67 N e. 62 N

You are standing still on a bathroom scale. The scale shows your weight 140 lbs. How much is the support force?   A. ZERO   B. 140 x 9.8 m/s^2   C. 140N   D. 140 lbs Then choose all that apply to centripetal force.   A. Gravitational and electrical forces can produce centripetal forces.   B. Centripetal force depends on tangential spreed and radius of curvature .   C. twice the radius needs half the centripetal force.   D. Measured in the units of N or kg m/s^2   E. Any type of force directed towards a fixed center.   F. Twice the speed needs four times the centripetal force.   G. Centripetal force depends on the mass, tangential speed and radius of the curvature.

3. A roller coaster is built so that there is a circular curve of radius 80.0 m at the top of one hill. The speed with which the car goes over the hill varies. Assume the passenger has a mass of 50.0 kg. The cars have wheels over and under the track so that it stays on and the passenger is wearing a seatbelt. a. If the speed is 20.0 m/s going over the top what is the force on the passenger? Force factor? Is the force from the seat or the belt?