V = I$\alpha$for an object rotating about a fixed axis, where $ \tau $ is the net torque acting on it, I is its rotational inertia, and $\alpha$is its angular acceleration. This expression:
A) is the definition of torque
B) is the definition of rotational inertia
C) is the definition of angular acceleration
D) follows directly from Newton's second law
E) depends on a principle of physics that is unrelated to Newton's second law

Question

V = I$\alpha$for an object rotating about a fixed axis, where  $ \tau $ is the net torque acting on it, I is its rotational inertia, and $\alpha$is its angular acceleration. This expression:
A) is the definition of torque
B) is the definition of rotational inertia
C) is the definition of angular acceleration
D) follows directly from Newton's second law
E) depends on a principle of physics that is unrelated to Newton's second law

Quizplus · Accepted Answer

This expression follows directly from Newton's second law applied to rotational motion. The net torque acting on the object is equal to the rotational inertia multiplied by the angular acceleration.

V = I α\alphaα For an Object Rotating About a Fixed Axis, Where

V = I $\alpha$ For an Object Rotating About a Fixed Axis, Where