What was the most serious money problem faced by people in the early united states?
a. the money they used lacked stability.
b. there was no single medium of exchange.
c. there were several standards of value.
d. some things lacked portability.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

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.

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?