What happens to the density of the mass decreases but the volume remains the same?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

However, had it been a real sound, the sound's pitch would have been increased by the doppler effect, since the falcon was moving the source of the sound. perpendicular to away from towards at the same speed as

In which of the following is positive work done by a person on a suitcase