The average speed of a Nitrogen molecule in air is about 764 m/s, and its mass is about 4.68 × 10^−26 kg. If it takes 2.9 × 10^−13 s for a nitrogen molecule to hit a wall and rebound with the same speed but in the opposite direc- tion, what is the magnitude of the average acceleration of the molecule during this time interval?
Answer in units of m/s2.
What is the magnitude of the average force that the molecule exerts on the wall?
Answer in units of N.

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.