3. An extremely light rod 1.00 m long has a 2.00-kg mass attached to one end and a 3.00-kg mass attached to the other. The system rotates at a constant angular speed about a fixed axis perpendicular to the rod that passes through the rod 30.0 cm from the end with the 3.00-kg mass attached. The kinetic energy of the system is measured to be 100.0 J. (a) What is the moment of inertia of this system about the fixed axis

  1.25 kg·m²

Explanation:

Multiply each mass by the square of its distance from the center of rotation. The moment of inertia of the system is the sum of those products.

(a) I = Σ(mr²) = (3.0 kg)(0.30 m)² +(2.0 kg)(0.70 m)² = 1.25 kg·m²

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )