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3 years ago

Why are you able to make someone on a swing have very large swings by only exerting very small forces on them?

1 answer:

3 0

Because almost all of the force is done by the weight of the person and the mechanism of the swing itself, when you push someone you only give them an increase in velocity, the acceleration comes from the weight at first and then from gravity when the person is coming down, which is why we bend our legs when coming down

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*An inductor is capable of dissipating 50W of heat energy when a current 0.8A flows through it at a certain frequency. Calculate

ale4655 [162]

I think that your answer would be D

8 0

3 years ago

Two cello strings, with the same tension and length, are played simultaneously. Their fundamental frequencies produce audible be

qwelly [4]

Explanation:

Let f₁ is the fundamental frequency, $f_1=8\ Hz$

Lower pitch frequency, $f_2=220\ Hz$

Fundamental frequency is, $f_1=\dfrac{1}{2L}\sqrt{\dfrac{T}{\mu_1}}$ .....(1)

Lower frequency is, $f_2=\dfrac{1}{2L}\sqrt{\dfrac{T}{\mu_2}}$ ..............(2)

Dividing equation (1) and (2) as :

$\dfrac{f_1}{f_2}=\sqrt{\dfrac{\mu_2}{\mu_1}}$

$\dfrac{\mu_2}{\mu_1}=(\dfrac{f_1}{f_2})^2$

$\dfrac{\mu_2}{\mu_1}=(\dfrac{8}{220})^2$

$\dfrac{\mu_2}{\mu_1}=0.00132$

So, the ratio of linear mass density μ of the string with the higher pitch to that of the string with the lower pitch is 0.00132. Hence, this is the required solution.

3 0

3 years ago

Which statement describes how nuclear power generation systems work?

galben [10]

Answer:

c- heat for electricity generation process comes from nuclear fission

Explanation:

nuclear fission is splitting of atoms to release energy held at nucleus of atoms

4 0

2 years ago

A train is travelling at 15m/s. It accelerates at 3m/s² for 20 seconds. How far does the train travel in this time?

Fittoniya [83]

Answer:

Explanation:

The answer is 900m

4 0

3 years ago

Convert 0.000238 m to cm

enot [183]

Answer:

0.0238 centimetre

Explanation:

multiply the length value by 100

3 0

3 years ago