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05holtel
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Homework Statement
While blowing its horn of frequency 451 Hz, a car accelerates at 0.64 m/s2.
The car starts from rest by your side and moves away.
How long will it take for the frequency you hear to decrease by 5%?
Hint: Do not forget to include the time it will take for sound to reach you.
Give your answer in s, and to three significant figures.
Only answer in numerical values, no units.
Homework Equations
speed of sound in air is 340 m/s
The Attempt at a Solution
fsource = fo (1/(1+vsource/c))
0.95 = (1/(1+vsource/c))
vsourve = 17.89m/s
V= v0 +at
t= 17.89/0.64
t = 28.0 seconds
This is wrong