A person began running due east and covered 15 km in 2.0 hr. What is the average velocity of the person? (Hint: v = d/t) Show al
1 answer:
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Answer:
Vs = 6.73 m/s or Vs = 16.3 m/s
Explanation:
frequency of the trains whistle (f) = 1.64 x 10^{2} Hz = 164 Hz
frequency of beats heard = 4 beats/s = 4 Hz
velocity of the stationary train (Vr) = 0
velocity of sound in air (V) = 343 m/s
velocity of the moving train (Vs) = ?
we can get the velocity of the moving train from the formula below
Fn = f x ...equation 1
where Fn = net frequency
- case one - assuming the train is approaching the station Fn = 164 + 4 = 168 Hz
substituting the known values into equation 1
168 = 164 x
1.02 =
Vs =
Vs = 6.73 m/s
- case two - assuming the train is leaving the station Fn = 164 - 4 = 160 Hz
substituting the known values into equation 1
168 = 160 x
1.05 =
Vs =
Vs = 16.3 m/s