In terms of roundness and smoothness, name an object which would be a good model of
earth?

ping pong ball

explanation:

an orange or chocolate glazed munchkin

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

the correct answer is(the type of energy described here is potential energy.)

explanation: now if the person holding the bow and arrow has now let go. the arrow shoots forward toward its target. the   type of energy then becomes