When a cannon fires a cannonball, the cannon will recoil backward because the:
a) energy of the cannonball and cannon is conserved.
b) energy of the cannon is greater than the energy of the cannonball.
c) momentum of the cannonball and cannon is conserved.
d) momentum of the cannon is greater than the energy of the cannonball.

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

What are two different ways you could find the value of a? explain these methods.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.