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valkas [14]
3 years ago
8

Astronomers have proposed the existence of an unexplained force that is causing the expansion of the universe to accelerate. Wha

t do they call this force?
dark matter
dark space
dark stars
dark energy
dark holes
Physics
2 answers:
Hoochie [10]3 years ago
6 0
<h3><u>Answer;</u></h3>

Dark matter

<h3><u>Explanation;</u></h3>
  • <em><u>Astronomers theorize that the faster expansion rate is due to a mysterious, dark force that is pulling galaxies apart. One explanation for dark energy is that it is a property of space.</u></em>
  • Space has amazing properties, many of which are just beginning to be understood.
  • Another explanation for dark energy is that it is a new kind of dynamical energy fluid or field. Dark matter makes up about 27%.
Alik [6]3 years ago
4 0
4. Dark Energy. This is the mysterious force causing the expansion of space. No one has ever seen this force.
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How much energy is needed to melt 5 g of ice? The specific latent heat of melting for water is 334000 J/kg.
Katen [24]

Answer:

The needed energy to melt of ice is 1670 J.

Explanation:

Given that,

Mass of ice = 5 g

Specific latent heat = 334000 J/kg

We need to calculate the energy

Using formula of energy

Q=mL

Where, m = mass

L = latent heat

Put the value into the formula

Q=5\times10^{-3}\times334000

Q=1670\ J

Hence, The needed energy to melt of ice is 1670 J.

5 0
3 years ago
How does the temperature affect the phase of water
Sever21 [200]

Answer:

Temperature affects phase change by slowing down the movement in between the atoms, thus causing a change in kinetic energy, which in turn causes the atoms to undergo forms of combining or a type of disepersion.

Explanation:

Kinetic energy while being the reason phase changes are constant, Kinetic Energy can be caused by other means. Pressure and temperature can affect many other states kinetic energy, which in turn can affect each state of matter. Making a group of atoms or compounds compacts will force the atoms to move closer together thus with a lower net kinetic energy energy. Reducing temperature also works along the same lines. Colder temperatures can slow down atomic movements which in turn will naturally make each atom move close to each other.

With all of the information provided, it is only feasible that pressure and temperature are directly corresponding with the matter and atomic phase change

8 0
2 years ago
A solid nonconducting sphere of radiusRcarries a chargeQdistributed uniformly throughout itsvolume. At a certain distancer1(r1&l
lara [203]

Answer:

E' = \frac{1}{8} E

Explanation:

Given data:

first case

Distance of electric field from center of sphere is r_1 <R

Electric field at r_1< R

E = \frac{kQr_1}{R^3}

second case

Distance of electric field from centre of sphere is r_1 < 2R

Electric field at r_1< 2R

E' = \frac{kQr_1}{8R^3}

so, we have

E' = \frac{1}{8} E

3 0
3 years ago
2 examples of mechanical waves would be: *
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C. sound waves and water waves

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3 years ago
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A scientist adds different amounts of salt to 5 bottles of water. She then
Vika [28.1K]
A. The time it takes for the water to boil.

because that is what you are testing
7 0
3 years ago
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