Asurface receiving sound is moved from its original position to a position three times farther away from the source of the sound. the intensity of the received sound thus becomes
a. nine times as low.
b. nine times as high.
c. three times as low.
d. three times as high.

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

You win the lottery and decide to impress your friends by exhibiting a million-dollar cube of gold. at the time, gold is selling for $ 426.60 per troy ounce, and 1.0000 troy ounce equals 31.1035 g. -how tall would your million-dollar cube be? en cm

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?