A model rocket has the (vertical) velocity vs. time graph shown. The rocket is launched from the ground and flies straight up while its engine fires . We have defined the upward direction to be “positive.” a. Circle the time on the graph when the rocket reaches its HIGHEST ALTITUDE.

b. Calculate the highest altitude it reached in the space below, making your method clear.

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