A200-m-wide river flows due east at a uniform speed of 2.0 m/s. a boat with a speed of 8.0 m/s relative to the water leaves the south bank pointed in a direction 30° west of north. what are the (a) magnitude and (b) direction of the boat’s velocity relative to the ground? (c) how long does the boat take to cross the river?

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