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bogdanovich [222]
3 years ago
13

You are trying to overhear a juicy conversation, but from your distance of 25.0 m , it sounds like only an average whisper of 20

.0 dB . So you decide to move closer to give the conversation a sound level of 70.0 dB instead. How close should you come? (in cm)
Physics
1 answer:
spayn [35]3 years ago
7 0

Answer:So You Decide To Move Closer To Give The Conversation A Sound Level Of 80.0dB Instead. ... You are trying to overhear a juicy conversation, but from your distance of 24.0m , it sounds like only an average whisper of 40.0dB .

Explanation:

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A heavy meterstick has a mass of 1 kg. When the meterstick is thrown like a spear past you, you measure its momentum to be 2mv.
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Answer:

Its length is measured to be 0.5 m

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From theory of relativity (mass variation), we know that:

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2(mo)v = (mo)v/√(1-v²/c²)

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Now, for relativistic length (L), we have the formula from same theory of relativity;

L = (Lo)√(1-v²/c²)

The rest length (Lo) of meter stick is 1 m, and the remaining term on right side √(1-v²/c²), known as Lorentz Factor, can be given by eqn (1), as equal to 1/2.

Thus,

L = (1 m)(1/2)

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