How do the forces in nuclear and chemical reactions differ? a. both reactions only need to overcome weak electrostatic forces. b. chemical reactions must overcome the strong nuclear force. c. nuclear reactions must overcome much stronger forces. d. nuclear reactions must overcome intermolecular forces.

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.