1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alex777 [14]
3 years ago
9

True or False. Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of ma

ny of the 100 billion other galaxies estimated to exist in the universe.
Physics
1 answer:
Genrish500 [490]3 years ago
7 0

Answer:

True

Explanation:

In 2019 was taken the first image of a supermassive black hole in the center of the galaxy M87 with the Event Horizon Telescope, which is a network of radio telescope located in different points of the Earth, with the purpose of making a telescope of the size of the Earth.

A radio telescope is an antenna that is capable to perceive the light in the radio part of the electromagnetic spectrum¹.

It is important to notice that in the picture what it can be seen is the effect that the black hole has in the nearby stars.

Key terms:

¹Electromagnetic spectrum: decomposition of light in its different wavelengths (from radio waves to gamma rays).

You might be interested in
A 25 kg child plays on a swing having support ropes that are 2.20 m long. A friend pulls her back until the ropes are 42◦ from t
Semmy [17]

Answer:

A) P.E = 138.44 J

B) The velocity of swing at bottom, v = 3.33 m/s

C) The work done, W = -138.44 J

Explanation:

Given,

The mass of the child, m = 25 Kg

The length of the swing rope, L = 2.2 m

The angle of the swing to the vertical position, ∅ = 42°

A) The potential energy at the initial position ∅ = 42° is given by the relation

                                P.E = mgh joule

Considering h  = 0 for the vertical position

The h at ∅ = 42° is  h = L (1 - cos∅)

                               P.E = mgL (1 - cos∅)

Substituting the given values in the above equation

                               P.E = 25 x 9.8 x 2.2 (1 - cos42°)

                                      = 138.44 J

The potential energy for the child just as she is released, compared to the potential energy at the bottom of the swing is, P.E = 138.44 J

B) The velocity of the swing at the bottom.

At bottom of the swing the P.E is completely transformed into the K.E

                  ∴                 K.E = P.E

                                     1/2 mv² = 138.44

                                     1/2 x 25 x v² 138.44

                                            v² = 11.0752

                                             v = 3.33 m/s

The velocity of the swing at the bottom is, v = 3.33 m/s

C) The work done by the tension in the rope from initial position to the bottom

             Tension on string, T = Force acting on the swing, F

                      W=L\int\limits^0_\phi{F} \, d \phi

                             =L\int\limits^0_\phi{mg.sin \phi} \, d \phi

                            = -Lmg[cos\phi]_{42}^{0}

                            = - 2.2 x 25 x 9.8 [cos0 - cos 42°]

                            = - 138.44 J

The negative sign in the in energy is that the work done is towards the gravitational force of attraction.

The work done by the tension in the ropes as the child swings from the initial position to the bottom of the swing, W = - 138.44 J

3 0
3 years ago
Help me, i don't know the answer ​
8_murik_8 [283]

Explanation:

1)

A) Bb BB

B) 50%

2)

A) 50%

B) <u> </u><u> </u><u> </u><u> </u><u> </u><u>b</u><u>.</u><u> </u><u> </u><u> </u><u>b</u>

B. Bb. Bb

b. bb. bb

4 0
2 years ago
Help me with this please​
Marianna [84]

Answer:

<u>Family</u>

1. Definition of a family

A family is a group of people living together in a home related by blood, marriage or adoption.

2. Two function of the family are;

  1. socialization for the children in the family.
  2. love and happiness should be in a family for it to be function.

3. Two types of family are;

  1. Single parent family- this family includes one parent and his or her child, we can say it's an incomplete family.
  2. nuclear family- this family includes the two parents and their children or child, this family is known as the complete family.

4. Two roles and responsibilities of the parents and children in the home are;

  1. both parents must and should protect their child or children from harm.
  2. the children must have respect for the family.

<u>Accident in the Home</u>

1. Definition of accident in the home

accidents in the home are common to persons of all ages, therefore home accidents occurs in one's home that may cause an result an injury of a person

2. Two types of accident in the home

  1. falls
  2. minor cuts and wounds

3. The two uses of cereals in cooking

Cereals in cooking are used as thickened agents.

4. complete table

1. minor cuts and wounds

  • Causes: these are caused by broken glasses, contact with sharp instruments such as knife, pins and needles.
  • Prevention: this can be prevented by keeping the Sharp tools in safe places after used

2. Poisoning

  • Causes: poisoning can caused by in a result from children taking tablets for sweets, which can lead to death.
  • preventions: you can prevent this by avoiding poisoning from the from the home or you could put it at a safe place that you know the child cannot get it.

<u>Care labels</u>

1. definition of care label

care labels can be defined as a permanent label or we can say a tag, which contains regular instructions that is attached at the back of a cloth.

3. two classification of carbohydrates

  1. Mono
  2. poly

6 0
3 years ago
Pls answer quick will mark brainlest and 5 stars
QveST [7]

Answer:A

Explanation:

It’s bigger I am not sure

7 0
2 years ago
Read 2 more answers
Can you please help me
konstantin123 [22]

Answer:

I dont know sorryyyyyyy

4 0
3 years ago
Other questions:
  • Explain what happens to the atoms in the reactants during a chemical reaction
    5·1 answer
  • Two objects, labeled A and B, are the same size. Object A has a density of 1.21 g/cm3. Object B has a density of 1.37 g/cm3. Bot
    15·2 answers
  • How long would it take for a ball dropped from the top of a 484-foot building to hit the ground? round your answer to two decima
    7·1 answer
  • Of the four states of matter, which has particles that are the most tightly packed together?
    11·1 answer
  • I NEED HELPP!!!!!!!!!!!!!!
    12·1 answer
  • Two charged concentric spherical shells have radii 8.83 cm and 15.4 cm. The charge on the inner shell is 5.03 × 10⁻⁸ C and that
    5·1 answer
  • Elaborate on the reason that "cola" type drinks are used to make effective marinades.
    13·2 answers
  • A dime is 1.35 mm thick. How many dimes would it take to reach the height of a table that is 32.0 inches tall? (1.00 inches = 2.
    7·1 answer
  • A velocity selector consists of a uniform electric field of 3.4*10^6 V/m and a uniform magnetic field of 42.0 mT, perpendicular
    15·1 answer
  • Describe the types of transportation
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!