Question1
A 8kg mass moves in a circular path of 4m radius on a frictionless horizontal table. It is attached to a string that passes through a frictionless hole in the center of the table. A second 28kg mass is attached to the other end of the string. The acceleration of gravity is 9.8m/s^2. Establish the period.
Question2
The radius of curvature of the track at the top of a loop-the-loop on a roller coaster is 12.0m. At the top of the loop, force the seat exerts on a passenger is 0.40 times her weight. How fast is the roller coaster moving at the top of the loop?