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Ivan
3 years ago
6

You are heading toward an island in your speed boat when you see a friend standing on the shore of the island. You sound the boa

t's horn. Is the wavelength of the sound your friend perceives greater than, less than, or equal to the wavelength that would be heard without any motion of the boat, and why?
Physics
1 answer:
monitta3 years ago
8 0

Answer:

Greater than

Explanation:

The Wavelength will be higher than what will be heard without any motion on the boat due to the Doppler Effect, which is the change in the frequency of a sound wave whenever there's a relative motion between the source of the wave and observer. The amount of shift in frequency depends on the speed of the source towards the observer; the higher the velocity of the source, the higher the shift.

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let the length of the beam be "L"

from the diagram

AD = length of beam = L

AC = CD = AD/2 = L/2

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m = mass of beam = 20 kg

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using equilibrium of torque about B

(m₁ g) (AB) = (mg) (BC) + (m₂ g) (BD)

30 (1.10) = (20) ((L/2) - 1.10) + (40) (L - 1.10)

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