When the temperature of the air is 50°c, the velocity of a sound wave traveling through the air is approximately a. 50 m/s. b. 361 m/s. c. 30 m/s. d. 381 m/s.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b