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4 years ago

Everything we know about stars comes from studying their _____.

2 answers:

8 0

Everything we know about stars comes from studying their radiation/light. By measuring the wavelength or frequency of light coming from objects in the universe, we can learn something about their nature. Starts emit a range of wavelengths. The frequency of light is directly related to its color, so it follows that stars have different colors because they have different peak wavelengths of light.

denis-greek [22]4 years ago

5 0

Light / Radiation. The light radiation defines its color. Thermal radiation for its temperature and the overall appearance of the wavelengths the star emits gives off the info from where astronomers and scientist are able to build up knowledge on the age and current state of the stars

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Explain How did Aristotle's inability to detect parallax lead him to propose a geocentric model of the solar system?

maxonik [38]

Answer:

Aristotle was blind, therefore could not see change in positions. Aristotle could see no detectable change in the positions of the stars, thought Earth was immovable.

Explanation:

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2 years ago

A tow truck pulls a 2,000-kilogram car with a net force of

son4ous [18]

Answer:

Twennnnyy wun

Explanation: 9

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3 years ago

The electric potential ( relative to infinity ) due to a single point charge Q is 400 V at a point that is 0.6 m to the right of

UkoKoshka [18]

Answer:

The potential at a distance of 0.9 m is 266.67 V.

Explanation:

Charge = Q

Potential is 400 V at a distance 0.6 m .

Let the potential is V at a distance 0.9 m.

Use the formula of potential.

$V = \frac{Kq}{r}\\\\\frac{V}{400}=\frac{0.6}{0.9}\\\\V = 266.67 V$

5 0

3 years ago

Help me ........... science Note l want answer true.......please;)

Irina-Kira [14]

Hey there!

The answer is C

Hope this helps you!

Always remember, you are A Work Of Art!
- Nicole <3 :)

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4 years ago

How far must you be from a 110 W speaker to have an intensity of 0.0439 W/m^2? (Treat the speaker as a point source.)

Lina20 [59]

Answer:

$d=14.12m$

Explanation:

Assume a point sound source that emits a sound power P (in W) evenly in all directions of space. Let us also assume that the medium does not absorb this sound power when it passes through it. At a distance d from the source this power will have been evenly distributed over the surface of a sphere of radius d. Therefore, the acoustic intensity I at distance d will be worth:

$I=\frac{P}{4\pi d^{2}}$

This is the expression of the so-called law of the square of distance: "the intensity is inversely proportional to the square of the distance to the source (considered punctual)".

$I=0.0439 \frac{W}{ m^{2}}$

$P=110W$

$d=\sqrt { \frac{P}{4 \pi\\I}$

$d=\sqrt{ \frac{110}{ 4\pi (0,0439)} }$

$d=\sqrt{{199.39}$

$d=14.12m$

3 0

3 years ago