Adisk with a c value of 1/2, a mass of 4 kg, and radius of 0.52 meters, rolls without slipping down an incline with has a length of 7 meters and angle of 30 degrees. at the top of the incline the disk is spinning at 23 rad/s. how fast is the disk moving (the center of mass) at the bottom of the incline in m/s?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? a b c d