Q. A 3.0-m-long rigid beam with a mass 150 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam?
Q. A 535 g ball swings in a vertical circle at the end of a 1.4 m-long string. When the ball is at the bottom of the circle, the tension in the string is 22 N. What is the speed of the ball at that point?