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VashaNatasha [74]
3 years ago
10

Which statement is true?

Physics
1 answer:
marshall27 [118]3 years ago
3 0

Answer:

B.The galaxies are moving away from us.

Explanation:

Universe is expanding from the time of Big bank.

AS the universe expand Galaxies get away from each other.Latest studies stay that the acceleration of universe is uncreasing due to Dark Energy.

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Does water transmit light
liq [111]
While the answer is that it does, it transmits light VERY poorly. Most of the light bounces off it and the rest is refracted into the ocean. This is why you can't see much that is far away from you in the ocean unlike if you're just on land.
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The big bang theory of the information and expansion of the universe is supported by the observed
dusya [7]
By Hubble theory in which universe is expanding, 
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3 years ago
Block 1 (mass 2.00 kg) is moving rightward at 10.0 m/s and block 2 (mass 5.00 kg) is moving rightward at 3.00 m/s. The surface i
DaniilM [7]

Answer:

a) 0.25m

b) 5 m/s

Explanation:

When the spring is compressed both boxes are moving with the same velocity, so applying the principle of linear momentum conservation:

m1*v_{o1}+m2*v_{o2}=(m1+m2)*v\\v=5m/s

Now applying the principle of energy conservation:

K1+K2+U_{g1}-U_e=Kf+U_{g2}\\K1+0-U_e=K2+0\\U_e=K1+K2-kf\\\frac{1}{2}*k*x^2+=\frac{1}{2}*m1*v1^2+\frac{1}{2}*m1*v1^2-\frac{1}{2}*(m1+m2)*v^2\\\\x=\sqrt{\frac{2.00kg*(10m/s)^2+5.00kg*(3.00m/s)^2-7.00kg*(5m/s)^2}{1120N/m}}\\x=0.25m

We got that the maximum compression is 0.25m.

5 0
3 years ago
Help please I give brainliest
shutvik [7]

Answer:

can someone help me with physics to

7 0
3 years ago
Read 2 more answers
The emissivity of galvanized steel sheet, a common roofing material, is 0.13 at temperatures around 300 K, while its absorptivit
vfiekz [6]

Answer:

Total heat transfer rate is combined convection and radiation transfer rate, multiplied with absorptivity factor. From that equation you can find temperature of the roof using iteration method.  

Explanation:

<u>Known:</u>

steel sheet roof emissivity ∈ = 0.13

steel sheet roof absorptivity \alpha_s = 0.65

air temperature T∞ = 16°C ...= 289K

heat transfer rate G_s = 750 W/m2

natural convection h = 7W/m2K

Total heat transfer rate is combined heat transfer rate of convection and radiation, multiplied with absorptivity factor:  

\alphaG_s=q_{conv} +q_{rad} =hA(T∞-T_m)+∈σA(T_{surf} -T_{s} )

\alphaG_s-h(T_s-T∞)-∈σ(T_{s} -T_{surf} )=0

2562-7T_s-7.371*10^-9=0

Use iteration method to solve for T_s

T_s=350.17 K...=77.17°C

In this particular situation, cat would not be comfortable with walking on a roof since its surface temperature is 77.17°C which may even cause burns to its paws.  

4 0
3 years ago
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