Assignment:
Question 1. A thin, 80.0gm disk with a diameter of 9.00cm rotates about an axis through its center with 0.220J of kinetic energy. What is the speed of a point on the rim?
Question 2. A 3.0-m-long rigid beam with a mass of 100 kg is supported at each end. An 80 kg student stands 2.0 m from support 1. How much upward force does support 1 exert on the beam?
Question 3. The 20-cm-diameter disk in the figure can rotate on an axle through its center.
What is the net torque about the axle? In Nm
Question 4. A 1.0 kg ball and a 2.0 kg ball are connected by a 1.0-m-long rigid, massless rod. The rod is rotating cw about its center of mass at 20 rpm. What torque will bring the balls to a halt in 5.0 s? in Nm