What is a system? a. a definite quantity of matter enclosed by a boundary b. a definite quantity that does no work c. a definite quantity that contains all energy d. a definite quantity that allows no heat to flow

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.