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Luda [366]
3 years ago
14

Elephants can communicate using very low frequency sound waves over long distances. An elephant makes a noise below human hearin

g at 16Hz. This low rumble moves at 350 m/s (speed of sound in air). This sound is detected by her friend 25 seconds later.
How far away is her friend?
Physics
1 answer:
saveliy_v [14]3 years ago
5 0

Answer:

8750 m

Explanation:

S= v x t

S= 350 x 25

S= 8750 m

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Answer:

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Explanation:

From table A-1 (Modern Compressible Flow: with historical perspective):

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If Po₁ = Po₂

\frac{P_{o2} }{P_{2} } =\frac{P_{o1} }{P_{1} } *\frac{P_{1} }{P_{2} } =36.73*\frac{1}{4} =91.825

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\frac{P_{o2} }{P_{2} } =91.825,M_{2} =3.63

Table A-5:

v₁ = 49.76°

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v₂ = 60.55°

μ₂ = 16°

θ = 60.55 - 49.76 = 10.79°

The angle for the forward Mach line is:

μ₁ = 19.47°

The angle for the rearward Mach line is:

θr = μ₂ - θ = 16 - 10.79 = 5.21°

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