Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

What object a collides with object b and bounces back its final momentum is?

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