Types of Chemical Reactions Project: Thermal Energy and Chemical Reactione
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The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?