A circular disc of 0.67 kg mass and radius of 0.3 m rotates with an angular speed of 8 rad/s. a) Find the moment of inertia of the disc.
b) Calculate the rotational kinetic energy of the disc.

Note: Show the details of your calculations as the final answer alone will not be acceptable.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.