The small car that has a mass of 20 [kg] rolls freely on the horizontal track and carries the 5 [kg] sphere mounted on the light rotating rod with r = 0.4 [m]. A geared motor drive maintains a constant angular speed ω = 4 [rad/s] of the rod. If the car has a speed |v| = 0.6 [m/s] when θ = 0, calculate |v| when θ = 60◦ . Neglect the mass of the wheels and any friction.

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

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

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.