A red car passes a blue car. Which is true?

A.
The blue car must be parked.
B.
The red car must be moving backwards.
C.
The blue car must be moving slowly.
D.
The red car is moving faster than the blue car.

Galileo was the first to notice that the moon has craters, valleys, and mountains. how might this have changed people's perception of the moon at the time?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Carbon 14 is a naturally occurring stable