A constant net torque is exerted on an object. Which of the following quantities for the object cannot be constant? (Select all that apply.)

A. kinetic energy
B. angular velocity
C. angular acceleration
D. moment of inertia
E. angular position

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?