The passengers in a roller coaster feel 42 % heavier than their true weight as the car goes through a loop with a 30 m radius of curvature.  What is the car's speed at the bottom of the loop?  Use g = 10 N/kg.

A certain string just breaks when it is under 25 N of tension. A boy uses this string to whirl a 2 kg stone in a horizontal circle of radius 3 m. The boy continuously increases the speed of the stone. At approximately what speed will the string break?

26. Snoopy, in hot pursuit of the Red Baron, is flying his vintage warplane in a “loop-the-loop" path. His instruments tell him that the plane is level (at the bottom of the loop) and travelling at a speed of 180 km/h. He is sitting on a set of bathroom scales. He notes that the scales show four times his normal weight. What is the radius of the loop, in metres?

A ball is on the end of a string. The ball is being swung in a vertical circle at a constant speed. The length of the string is 1.25 m. The mass of the ball is 2.10 kg. The maximum tension the string can withstand is 61.0 N. What is the max speed of the ball without breaking the string when the ball is at the top of the circle (point a)?

At a circus, a stunt rider is going to do a "Loop-de-Loop". The radius of the circular part of the track is 8.13 m. The mass of the motorcycle and the rider is 318. kg. What is the minimum speed the motorcycle must have to just make it around the loop without falling?

High-speed ultracentrifuges are useful devices to sediment materials quickly or to separate materials. An ultracentrifuge spins a small tube in a circle of radius 10.5 cm at 60000.0 rev/min. What is the centripetal force experienced by a sample that has a mass of 0.00330 kg?

A ball is swung in a horizontal circle at a constant speed. Each circle takes 0.85 seconds to complete and the rope is 0.40 m long. What is the centripetal acceleration?

Ch3qrt # 1 ,A carousel has a radius of 12.0 m and turns once in 45.0 s. What is the speed of a rider on the edge of the carousel?#2 An airplane with a mass of 800 kg is flying in a circle of radius 500 m at 50 m/s. What is the centripetal force required to keep the airplane flying in the circle?#3 You are on a subway holding yourself off the floor by pulling on an overhead rail. The subway starts moving, and your body makes an angle of 20.0° with the vertical. Determine the acceleration of the subway car.

A car approaches the top of a hill that is shaped like a vertical circle with a radius of 35.3 m. What is the fastest speed that the car can go over the hill without losing contact with the ground?

A 615 kg car completes one lap in a time of 14.3 sec around a circular track with a radius of 50.0 m. What is the acceleration of the car? What force must the track exert on the car to produce this acceleration?