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Lubov Fominskaja [6]
3 years ago
6

Help me pls

Physics
1 answer:
Zina [86]3 years ago
8 0

Answer:

Explanation:

the first one is D

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Answer:

28.28 ms-1

Explanation:

v² = u² + 2as

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What is the frequency of a wave whose wavelength is 0.7m and whose velocity is 120m/s?
ANEK [815]

Answer:

f=171.43Hz

Explanation:

Wave frequency is the number of waves that pass a fixed point in a given amount of time.

The frequency formula is: f=v÷λ, where <em>v</em> is the velocity and <em>λ</em> is the wavelength.

Then replacing with the data of the problem,

f=\frac{120\frac{m}{s} }{0.7m}

f=171.43\frac{1}{s}

f=171.43 Hz (because \frac{1}{s} = Hz, 1 hertz equals 1 wave passing a fixed point in 1 second).

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