The high-altitude stealth jet SR-71 \"Blackbird\" is a record-holding supersonic
ID: 1485228 • Letter: T
Question
The high-altitude stealth jet SR-71 "Blackbird" is a record-holding supersonic aircraft with an amazingly small radar signature, a. 1 he Blackboard flew at 90,000 feet. The air temperature at that height is 228K (-45.0K). Calculate the sound speed in air at this temperature with three sig figs. The jet could go up to Mach 3.40 (~ten football fields each second), which is what speed? What angle would the shock wave cone extend from the plane? If the Blackbird flew through warmer air, the Mach number would (increase/stay the same/decrease) and the shock cone would be (wider/stay the same/narrower). A train moves at 40.0m/s and sounds its whistle, which has a frequency 500.Hz. The question is what frequency you hear, because the train is moving directly toward you and you're standing still. If the train is moving toward you, will you hear a higher or lower frequency? Calculate the frequency you hear if the temperature is 273K (32 degree F) What wavelength does the sound you hear correspond to?Explanation / Answer
4.
T = 228 K = - 45 c
V = 331.4 + 0.6 T = 331.4 + (0.6) (-45) = 304.4 m/s
b)
length = 120 m
time = 1 sec
so speed = 120 m/s
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