A wheel and axle on a bicycle are designed with an axle radius of 0.5 feet and a wheel radius of 2 feet . If a force of 200 pounds is applied to the axle, what is the maximum output force of the bike wheel? a) 1,200 lb
b) 50 lb
c) 200 lb
d) 800 lb

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.