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natima [27]
3 years ago
6

how do scientists know that black holes exist A. by running experiments on the sun B. by observing objects and light around blac

k holes C. by viewing black holes with powerful telescopes D. all of the above E. none of the above
Physics
2 answers:
NNADVOKAT [17]3 years ago
8 0

Answer:

E. none of the above

Explanation:

I hope thats right

bulgar [2K]3 years ago
5 0

Answer:

Answer choice D)

Explanation:

even though they don’t emit light, they do have lots of gravity.

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Recall some things you already know about projectile motion. Does a force in the vertical direction affect the horizontal compon
azamat

Answer:

vertical force cannot change the velocity on the x-axis.   t =x/v₀ₓ

Explanation:

The force is a vector magnitude, so the forces on the x-axis affect the acceleration on this axis. Consequently a vertical force cannot change the velocity on the x-axis.

     F_{y} = m g

    Fₓ = 0

The horizontal velocity in projectile motion is constant, if we neglect the air resistance, so it can be used to find the time of a horizontal displacement

       x = v₀ₓ t

       t =x/v₀ₓ

The only magnitude that is the same for both movements is the time that is a scalar

7 0
3 years ago
Two resistors with resistance values of 4.5 Ω and 2.3 Ω are connected in series or parallel across a 30 V potential difference t
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3 years ago
What do stars begin as
Valentin [98]
Cloud of dust and gas!
7 0
3 years ago
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Which of the following is an inclined plane wrapped around a rod?
zlopas [31]

Alright well the Answer to your question is A). Screw

Hope this helps have a nice day : )

If u want i can explain why

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3 years ago
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Monochromatic light of wavelength, lambda, is traveling in air. The light then strikes a thin film having an index of refraction
kumpel [21]

Answer:

The  correct option is  H

Explanation:

From the question we are told that

    The index of refraction of  coating is  n_1

       The  index of refraction of material  is  n_2

   

Generally the condition for constructive for a thin film interference is mathematically represented

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Here  t represents the thickness

For minimum thickness  m =  0

So

           2 *  t  =0  + \frac{1}{2}\frac{\lambda}{n_1 }

=>        t  =\frac{\lambda}{4n_1 }

3 0
3 years ago
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