A ship is located where the depth of the ocean is 3 km. Determine the time needed for a sonar signal to reflect off the bottom and return to the ship. Assume the average water temperature is 10°C....

A ship is located where the depth of the ocean is 3 km. Determine the time needed for a sonar signal to reflect off the bottom and return to the ship. Assume the average water temperature is 10°C. Take
 = 1030 kg/m³
and
 = 2.11(10⁹) Pa for sea water.

Determine the Mach number for a race car that travels at 360 km/h in 15°C weather.