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.

Research and discuss the aurora borealis in terms of electric charges, magnetic fields, and forces. which times of the year are best for seeing the northern lights, and where are the best places to view them? explain your answers. also identify links to good images. if you’ve ever seen the aurora borealis, describe your experience and note the time and place that you saw it.