1 2 3 4 5 Disk ysIa A torsion pendulum is made from a disk of mass m = 7.2 kg and radius R = 0.73 m. A force of F = 42.9 N exerted on the edge of the disk rotates the disk 1/4 of a revolution from equilibrium. 1) What is the torsion constant of this pendulum? N-m/rad Submit 2) What is the minimum torque needed to rotate the pendulum a full revolution from equilibrium? N-m Submit 3) What is the angular frequency of oscillation of this torsion pendulum? rad/s Submit 4) Which of the following would change the period of oscillation of this torsion pendulum? O increasing the mass decreasing the initial angular displacement replacing the disk with a sphere of equal mass and radius O hanging the pendulum in an elevator accelerating downward Submit +