A "swing" ride at a carnival consists of chairs that are swung in a circle by 18.8 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 214 kg. (a) Determine the tension in the cable attached to the chair. (b) Find the speed of the chair. (a) Number i (b) Number i Units Units 60.0

I whirl John (mass 0.27 kg) over my head in a circle. There is a spring scale between my hand and the string, so I can measure the force of tension in the string, which I find to be 2.12 N. I measure the length of the string (the radius of the circle) and find it to be 1.34 m. Assuming that John's speed is not changing, how fast is he going?

Leilani loads luggage into a Hawaiian Air passenger plane bound for Vegas using a conveyor belt tilted at an angle of 20°. She places a few pieces of luggage onto the belt before it starts to move. When she turns the belt on it takes 0.70 s for it to reach a top speed of 1.2 m/s. Does the luggage slip? Assume µs = 0.50 between the luggage and the belt. (12 points) %3D

It is well known that runners run more slowly around a curved track than a straight one. One hypothesis to explain this is that the total force from the track on a runner's feet--the magnitude of the vector sum of the normal force (that has average value mgmg to counteract gravity) and the inward-directed friction force that causes the runner's centripetal acceleration--is greater when running around a curve than on a straight track. Runners compensate for this greater force by increasing the time their feet are in contact with the ground, which slows them down. For sprinters running at 8 m/s around a curved track of radius 16 m, how much greater (as a percentage) is the average total force on their feet compared to when they are running in a straight line?