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Ivan
3 years ago
12

Light from distant galaxies most likely shows a ...red shift, indicating that the universe is expandingblue shift, indicating th

at the universe is expandingred shift, indicating that the universe is contracting blue shift, indicating that the universe is contracting
Physics
1 answer:
ELEN [110]3 years ago
5 0

Answer:

red shift, indicating that the universe is expanding

Explanation:

Doppler effect occurs when a source of a wave (e.g. light, or sound waves) moves relative to an observer; as a result of this relative motion, the wavelength of the wave appears lengthened/shortened to the observer. Two situations can occur:

- The source of the wave is moving towards the observer - in this case, the wavelength of the wave becomes shorter. If the wave is visible light, such as the light emitted by distant galaxies, this means that the wavelength of the light shifts towards the blue-end of the spectrum (blue-shift)

- The source of the wave is moving away from the observer - in this case, the wavelength of the wave becomes longer. If the wave is visible light, such as the light emitted by distant galaxies, this means that the wavelength of the light shifts towards the red-end of the spectrum (red-shift)

In our universe, we observe a red-shift for all the distant galaxies: this means that these galaxies are moving away from us, so this is an indication that the universe is expanding.

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An extended body (not shown in the figure) has its center of mass at the origin of the reference frame. In the case below give t
Vera_Pavlovna [14]

The direction of torque τ this method is mathematically given as

D=X  

Option A is correct.

<h3>What is the direction of torque?</h3>

Generally, the equation for torque is  mathematically given as

τ = r X F

Hence to decipher the torque direction with respect to the center of mass of the body due to force F acting on the body at a location indicated by the vector r

  • We utilize our right hand.
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  • Place our right-hand palm on F
  • Then slowly we sweep r into F.
  • The path or direction of the thumb will provide the direction of the torque.

In conclusion, the direction of this method is

D=X   Option A.

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8 0
2 years ago
Cosine law can be applied when .....................
jarptica [38.1K]

Answer:

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3 0
2 years ago
What is the surface temperature of a star that has a peak wavelength of 290 nm?
Maksim231197 [3]
We need to use Wien's Law

Wavelength = 0.0028976 [m.K] / T

This establishes a relation between the wavelength and temperature of a black body (any body that absorbs radiation, such as the stars)

T = 0.0028976 [m.K]/290 E-9[m]  = 9991.724 K
5 0
3 years ago
A rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Eart
Charra [1.4K]
11,000 m = 11 km

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3 years ago
An iron block of mass 10 kg rests on a wooden plane inclined at 30° to the horizontal. It is found
Kaylis [27]

I assume the 100 N force is a pulling force directed up the incline.

The net forces on the block acting parallel and perpendicular to the incline are

∑ F[para] = 100 N - F[friction] = 0

∑ F[perp] = F[normal] - mg cos(30°) = 0

The friction in this case is the maximum static friction - the block is held at rest by static friction, and a minimum 100 N force is required to get the block to start sliding up the incline.

Then

F[friction] = 100 N

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⇒   µ = (100 N) / (84.9 N) ≈ 1.2

5 0
2 years ago
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