1. Synthesize Information You push your younger sister on a swing in a park. Then you
give her a harder push. Explain what happens
in each case, in terms of the second and third
laws of motion

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

What happens when the vapor pressure of a liquid is equal to the external pressure?

Use vsepr theory to predict the molecular geometry of the molecule hcn.