How much pressure is exerted on the head of a nail when it is struck with a force of 50N? The area of cross-section of the nail head is 0.2m2.

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

Identify the type of synthetic material used in each object

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.