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Author Question: How fast (in m/s) is the Concorde moving if it reaches Mach 1.5? (The speed of sound in air is 344 ... (Read 126 times)

leilurhhh

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on: Jul 28, 2018
How fast (in m/s) is the Concorde moving if it reaches Mach 1.5? (The speed of sound in air is 344 m/s.)
 a. 229
  b. 516
  c. 416
  d. 728
  e. 858

Question 2

A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.)
 a. 242
  b. 238
  c. 240
  d. 236
  e. 234


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sailorcrescent

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Reply #1 on: Jul 28, 2018
Answer to Question 1

b

Answer to Question 2

c


leilurhhh

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Reply 2 on: Jul 28, 2018
Gracias!

kthug

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Reply 3 on: Yesterday
Wow, this really help

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