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Homework Statement
The speed of the sound in the air (in meter per second) depends on temperature according to approximate expression
V= 313.5 + 0.607Tc
where Tc is the Celsius temperature. In dry air, the temperature decreases about 1 degree Celsius for every 150M rise in altitude
Homework Equations
a) assume the change is constant up to an altitude of 9000m what time interval is required for the sound from airplane flying at 9000m to reach the ground on a day when the ground temperature is 30 Celsius