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jok3333 [9.3K]
3 years ago
11

How do scientists infer the presence of black holes since they can't be directly observed?

Mathematics
1 answer:
Andrej [43]3 years ago
7 0

Answer:

The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Matter that falls onto a black hole can form an external accretion disk heated by friction, forming quasars, some of the brightest objects in the universe.

Step-by-step explanation:

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(x + 1 - 32x^2) + (8x + 21x^2 - 1)
Paladinen [302]

Answer:

-11x^2+9x

Step-by-step explanation: I am assuming you want to simply the problem so I did it for you!

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3 years ago
Which property is illustrated by 6×5=5×6?
Harlamova29_29 [7]
Commutative Property of Multiplication.  
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3 years ago
How many feet are in 108 inches?
MissTica
Well first we need to know how many inches are in one foot which is 12 inches for every foot. So now we can take 108 inches / 12 because there are 12 inches to a foot and we need to convert inches to feet. Which gives us are end answer of 9 feet in 108 inches.
7 0
3 years ago
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Find the measurements (the length L and the width W) of an inscribed rectangle under the line with the 1st quadrant of the x &am
Leni [432]

The question is incomplete. Here is the complete question.

Find the measurements (the lenght L and the width W) of an inscribed rectangle under the line y = -\frac{3}{4}x + 3 with the 1st quadrant of the x & y coordinate system such that the area is maximum. Also, find that maximum area. To get full credit, you must draw the picture of the problem and label the length and the width in terms of x and y.

Answer: L = 1; W = 9/4; A = 2.25;

Step-by-step explanation: The rectangle is under a straight line. Area of a rectangle is given by A = L*W. To determine the maximum area:

A = x.y

A = x(-\frac{3}{4}.x + 3)

A = -\frac{3}{4}.x^{2}  + 3x

To maximize, we have to differentiate the equation:

\frac{dA}{dx} = \frac{d}{dx}(-\frac{3}{4}.x^{2}  + 3x)

\frac{dA}{dx} = -3x + 3

The critical point is:

\frac{dA}{dx} = 0

-3x + 3 = 0

x = 1

Substituing:

y = -\frac{3}{4}x + 3

y = -\frac{3}{4}.1 + 3

y = 9/4

So, the measurements are x = L = 1 and y = W = 9/4

The maximum area is:

A = 1 . 9/4

A = 9/4

A = 2.25

6 0
3 years ago
What fractional part of a kilometer is a meter ? ​
Crazy boy [7]

a kilometer is 1000 meters. a meter is 1 meter so the answer is:

1/1000

6 0
3 years ago
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