Negatively charged particles that orbit the nucleus of an atom are a. electrons b. protons c. neutrons

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

What kind of simple machine is a catapult?

What quantity do units represent in value