To see if such a strong magnetic field could pose health risks for nearby workers, calculate the maximum acceleration the field could produce on na+ ions (of mass 3.8×10−26 kg) in blood traveling through the aorta. the speed of blood is highly variable, but 50 cm/s is reasonable in the aorta. (express your answer to two significant figures.)

Which atomic model was proposed as a result of j. j. thomson’s work?

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.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.