The variables _ and _ affect the gravitational force between objects

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished