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Oduvanchick [21]
3 years ago
14

What does the blackboard do when white light falls on it?​

Physics
1 answer:
shusha [124]3 years ago
5 0
Actually a black board has all colours in light or white light . So when light falls on it board absorbs all colours because all are present so no light is reflected back. That is the case, and so it will appear black as it absorbs all colours of light that fall on it .
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Need help! Thanks for whoever answers.
Hunter-Best [27]

Answer:

2021 + 100000000

Explanation:

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5 0
3 years ago
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Consider a satellite in a circular orbit around the Earth. If it were at an altitude equal to twice the radius of the Earth, 2RE
Elenna [48]

Answer:

v=\sqrt{\frac{gR_E}{2}}

Explanation:

Satellites experiment a force given by Newton's Gravitation Law:

F=\frac{GMm}{r^2}

where M is Earth's mass, m the satellite's mass, r the distance between their gravitational centers and G the gravitational constant.

We also know from Newton's 2nd Law that <em>F=ma, </em>so putting both together we will have:

ma=\frac{GMm}{r^2}

a=\frac{GM}{r^2}

If we are on the surface of the Earth, the acceleration would be g and r=R_E (Earth's radius):

g=\frac{GM}{R_E^2}

Which we will write as:

gR_E^2=GM

If we are on orbit the acceleration is centripetal (a=\frac{v^2}{r}), so we have:

\frac{v^2}{r}=a=\frac{GM}{r^2}=\frac{gR_E^2}{r^2}

v^2=\frac{gR_E^2}{r}

v=\sqrt{\frac{gR_E^2}{r}}

And if this orbit has a radius r=2R_E we have:

v=\sqrt{\frac{gR_E^2}{2R_E}}=\sqrt{\frac{gR_E}{2}}

3 0
3 years ago
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What do you mean by impulse ratio?​
mars1129 [50]
<h2>Answer:</h2>

<h3><em><u>The impulse ratio of an insulator can be defined as the ratio of impulse peak voltage to the peak voltage. It is used to determine the value of flashover or puncture of insulation. Generally, the impulse ratio of the insulator is high.</u></em></h3>
3 0
2 years ago
What is the main reason why fewer nuclear power plants are being built today, compared to 40 years ago?
shusha [124]
<span>nuclear power plants have become to expensive these days


</span>
6 0
3 years ago
Use the following information to answer the next question.
melamori03 [73]

Answer:

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5 0
3 years ago
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