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wlad13 [49]
3 years ago
5

When comparing a star’s absolute magnitude to its apparent magnitude, which is usually the case? Select all that apply.

Physics
1 answer:
kirza4 [7]3 years ago
3 0

All four choices are true statements !

(I've never seen that before in a Brainly question.)

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Diffraction supports the:<br><br> A. wave theory of light.<br><br> B. particle theory of light.
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The answer is a hope its helps you
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If the mass of the book is 50 sliding with acceleration 1.2 m/s ^ 2 then the friction force is
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73N

Explanation:Just multiply 1.2^2 by 50

3 0
2 years ago
I dnt know how to do it
NNADVOKAT [17]

Here's what you need to know about waves:

Wavelength = (speed) / (frequency)

Now ... The question gives you the speed and the frequency,
but they're stated in unusual ways, with complicated numbers.

Frequency:  How many each second ?
The thing that's making the waves is vibrating 47 times in 26.9 seconds.
Frequency = (47) / (46.9 s) =  1.747... per second.  (1.747... Hz)

Speed:  How far a point on a wave travels in 1 second.
The crest of one wave travels 4.16 meters in 13.7 seconds.
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4 0
3 years ago
18. Which would be the most reliable source of information to use for a history report? (2 points)
Paladinen [302]

Answer:

encyclopedia most reliable I think

3 0
3 years ago
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A 4.79 g bullet moving at 642.3 m/s penetrates a tree trunk to a depth of 4.35 cm. Use work and energy considerations to find th
vladimir1956 [14]

Answer:

Force, F=2.27\times 10^4\ N

Explanation:

Given that,

Mass of the bullet, m = 4.79 g = 0.00479 kg

Initial speed of the bullet, u = 642.3 m/s

Distance, d = 4.35 cm = 0.0435 m

To find,

The magnitude of force required to stop the bullet.

Solution,

The work energy theorem states that the work done is equal to the change in its kinetic energy. Its expression is given by :

F.d=\dfrac{1}{2}m(v^2-u^2)

Finally, it stops, v = 0

F.d=-\dfrac{1}{2}m(u^2)

F=\dfrac{-mu^2}{2d}

F=\dfrac{-0.00479\times (642.3)^2}{2\times 0.0435}

F = -22713.92 N

F=2.27\times 10^4\ N

So, the magnitude of the force that stops the bullet is 2.27\times 10^4\ N

7 0
3 years ago
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