for an object rotating about a fixed axis, where 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

for an object rotating about a fixed axis, where    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

The expression is a direct application of Newton's second law for rotation, which relates the torque, rotational inertia, and angular acceleration of an object rotating about a fixed axis.

For an Object Rotating About a Fixed Axis, Where α\alphaα Is Its Angular Acceleration

For an Object Rotating About a Fixed Axis, Where $\alpha$ Is Its Angular Acceleration