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3 years ago

Suppose a star is 500 light- years away from earth is moved to be 600 light - years away. Which statement is correct?

Physics

2 answers:

mina [271]3 years ago

5 0

D. the value of the star's apparent magnitude increases

ExtremeBDS [4]3 years ago

4 0

Answer:

Explanation:

Apparent magnitude of a star is the brightness of the star observed from the Earth at its actual position. The value extends in both positive and negative direction. Increasing value of apparent magnitude in positive direction means that the brightness is decreasing. Absolute magnitude is the apparent magnitude of the star when the star is at 10 parsecs distance away from earth.

It is given that a star is 500 light-years away from earth moved to be 600 light years away. The value of absolute magnitude of the star does not changes. But the value of apparent magnitude changes with the distance. It would increase as the distance would increase. The star would appear less bright.

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2 years ago

If two identical trees are cut down, one with a hand saw, and one with an electric saw...

nataly862011 [7]

The hand saw would involve more work because it takes more time and effort.

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3 years ago

Which of the four fundamental forces is responsible for holding together the molecules of the pizza dough as it is spinning in t

defon

Answer:

None.

Explanation:

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2 years ago

If the resultant of two velocity vectors of equal magnitude is also of the same magnitude, then which statement must be correct?

Tamiku [17]

The correct option is C) The angle between the vectors is 120°.

Why?

We can solve the problem and find the correct option using the Law of Cosine.

Let A and B, the given two sides and R the resultant (sum),

Then,

$R=A=B$

So, using the law of cosines, we have:

$R^{2}=A^{2}+B^{2}+2ABCos(\alpha)\\ \\A^{2}=A^{2}+A^{2}+2*A*A*Cos(\alpha)\\\\0=A^{2}+2*A^{2}*Cos(\alpha)\\\\Cos(\alpha)=-\frac{A^{2}}{2*A^{2}}=-\frac{1}{2}\\\\\alpha =Cos(-\frac{1}{2})^{-1}=120\°$

Hence, we have that the angle between the vectors is 120°. The correct option is C) The angle between the vectors is 120°

Have a nice day!

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2 years ago

If the energies sound in the device is microphone what is the energy out

Katen [24]

Answer:

Microphones are a type of transducer - a device which converts energy from one form to another. Microphones convert acoustical energy (sound waves) into electrical energy (the audio signal). Different types of microphone have different ways of converting energy but they all share one thing in common: The diaphragm.

Explanation:

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3 years ago