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Rudik [331]
3 years ago
11

A pendulum is swinging. It swings 85 complete swings and this takes 102 seconfs. What is the frequency? A. 0.83 Hz B.17Hz C.187

Hz D.1.2 Hz​
Physics
1 answer:
Serga [27]3 years ago
3 0

Answer:

A: 0.83 Hz

Explanation:

Frequency can be calculated in a multitude of ways. The one way that is going to help you solve this problem is (# of times/seconds)

so you would divide 85 swings/102 seconds

= 5/6 or 0.8333 Hz

so your answer is A

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Answer:

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Explanation:

F = 40 v²........(1)

F = mv\frac{dv}{dS}.........(2)

Equating (1) and (2)

-mv\frac{dv}{dS} = 40 v^2\\\\v\frac{dv}{dS} = \frac{-40 v^2}{m}  \\\\m = 450 kg\\v\frac{dv}{dS} = \frac{-40 v^2}{450}\\\\ \frac{dv}{v} = \frac{40}{450} dS\\

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\int\limits^{10}_1 {\frac{1}{v} } \, dv = \frac{-40}{450}  \int\limits^S_0  \, dS \\\\ln\frac{1}{10} = \frac{-40}{450} (S-0)\\\\S = \frac{-40}{450} ln(0.1)\\\\S = 25.9 m.

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