3 years ago

True or False:

Physics

2 answers:

gizmo_the_mogwai [7]3 years ago

7 0

Answer:

Explanation:

false because the light of some stars can be very bright, but it can also be very far from the earth.

have a nice day

mart [117]3 years ago

3 0

This is a true statement

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How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−214.

Musya8 [376]

Answer:

There are 887.5 number of excess electrons on the each spheres.

Explanation:

It is given that, the force of repulsion between two spheres is, $F=4.57\times 10^{-21}\ N$

We know that the force of attraction or repulsion between charges is given by :

$F=\dfrac{kq^2}{r^2}$

It is assumed that the separation between the spheres is 20 cm or 0.2 m. So,

$q=\sqrt{\dfrac{Fr^2}{k}}$

$q=\sqrt{\dfrac{4.57\times 10^{-21}\times (0.2)^2}{9\times 10^9}}$

$q=1.42\times 10^{-16}\ C$

Let there are n excess electrons that must be present on each sphere. It can be given by using quantization of charge as :

$q=ne$

$n=\dfrac{q}{e}$

$n=\dfrac{1.42\times 10^{-16}}{1.6\times 10^{-19}}$

n = 887.5 electrons

So, there are 887.5 number of excess electrons on the each spheres. Hence, this is the required solution.

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3 years ago

at room temperature, iron is a solid and mercury is a liquid. based on this information we can infer thata. iron has a higher bo

olchik [2.2K]

A. iron has a higher boiling point thanmercury.

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4 years ago

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As light shines from air to another medium, i = 30.0o, the light bends toward the normal and refracts at 22.0o. What is the inde

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The answer is n = 1.3347

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A merchant in Katmandu sells you a solid gold 1.00-kg statue for a very reasonable price. When you get home, you wonder whether

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Answer:

a) 51.8 cm³

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Your answer would be 4.0 hz.

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