What happens when a penny is dropped from a height of 20 meters? a. it falls at a constant velocity b. its mass doubles for every second it falls c. the force of gravity causes it to accelerate d. it changes direction every 9.8 meters

Which best represents the law of conservation of mass ?

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

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