2 years ago

A train travels 4200 km in 90 hours. What is its speed?

Physics

1 answer:

denis23 [38]2 years ago

6 0

Answer: I think its 120

Explanation: thx for the free points :)

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Imagine a small child whose legs are half as long as her parent’s legs. If her parent can walk at maximum speed V, at what maxim

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Answer:

$\boxed{v=\frac {V}{\sqrt {2}}}$

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We know that speed is given by dividing distance by time or multiplying length and frequency. The speed of the father will be given by Lf where L is the length of the father’s leg ad f is the frequency.

We know that frequency of simple pendulum follows that $f=\frac {1}{2\pi} \sqrt {\frac {g}{l}}$

Now, the speed of the father will be $V=Lf= L\times (\frac {1}{2\pi} \sqrt {\frac {g}{l}})$ while for the child the speed will be $v=\frac {L}{2}\times (\frac {1}{2\pi} \sqrt {\frac {g}{0.5l}})$

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3 years ago

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