The roller coaster is at the top of a 72m hill and has a mass of 98.57kg. the ball has energy calculate it

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?

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9

What part of the ear is names after tools, such as the hammer and the anvil?