The chemical combination of two or more different atoms in fixed amounts is called a(n)
element.
compound.
orbit.
mixture.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

What do we mean by the event horizon of a black hole?