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4 years ago

What is the name for the change in a stars spectrum when it moves wawy from the earth

2 answers:

8 0

When a source of light moves away from you, you see the characteristic lines in its spectrum move toward slightly longer wavelengths. Lines in the visible part of the spectrum move toward the red end.

When a source of light moves toward you, you see the characteristic lines in its spectrum move to slightly shorter wavelengths. Lines in the visible part of the spectrum move toward the violet end.

We see these 'shifts' when we look at the spectra of stars. "Red shift" is the change in the spectrum of a star when it's moving away from us, and "Blue shift" is the change when it's moving toward us. These measurements are the only way we have of measuring the radial motion of stars, and their speeds toward or away from us.

The whole subject of why a spectrum shifts toward longer or shorter wavelengths was explained by the Austrian physicist Christian Doppler in 1842, and it's known as the "Doppler Shift" in honor of him and his work.

andreev551 [17]4 years ago

6 0

Some call it the "Doppler Shift", while others call it the "Red Shift"

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2.1a - Fnet / m = a (11/8)

Ray Of Light [21]

Explanation:

According to the free body diagram attached below, there are only two forces that are acting upon the block, namely the force tension of the rope acting upwards and the weight of the block acting downwards.

Therefore, the magnitude of the net (resultant) force exerted on the block is

$\vec{F}_{\text{net}} \ = \ \vec{F}_{\text{tension}} \ - \ \vec{F}_{\text{weight}} \\ \\ \vec{F}_{\text{net}} \ = \ 250 \ \text{N} \ - \ 120 \ \text{N} \\ \\ \vec{F}_{\text{net}} \ = \ 130 \ \text{N}$ .

Since the magnitude of $\vec{F}_{\text{tension}}$ > magnitude of $\vec{F}_{\text{weight}}$ , this implies that the block will accelerate upwards.

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2 years ago

What is a Homonym for a type of cloak?

blsea [12.9K]

Answer:

In both cases, the sound and spelling are the same, and only the definition changes. Here are 30 more examples of homonyms. Note that some homonyms have more than two meanings (for example, "tender" can also mean sensitive, easily chewed, or even refer to chicken strips), but to keep things simple we've only included two in our homonyms list:

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3 years ago

Over many years a limestone surface is exposed to slightly acidic rain. Which result is likely to occur in the limestone

kvasek [131]

Answer:

calcium carbonate is transformed into calcium sulfate

Explanation:

Limestone stones are formed by calcium carbonate (Ca Co3), when acid rain falls with a little H2SO2, a chemical reaction of the type

Ca Co3 + H2SO4 → CO2 + H2O + CaSo4

Calcium sulfate is much weaker than alatium carbonate, which is why the stone tends to break under its weigh

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3 years ago

Choose the correct statement below that accurately describes the shear and normal stresses in a beam. A. Shear stresses are maxi

Scorpion4ik [409]

Answer:

A. Shear stresses are maximum at the neutral axis and normal stresses are maximum furthest from the neutral axis.

Explanation:

Normal stress :

Normal stress is defined as the stress or the restoring force that occurs on the plane when an external axial load is applied on it. For a beam the normal stress is maximum at the point furthest from the neutral axis and is zero at the neutral axis of the beam.

Shear stress :

Shear stress is a stress which occurs when the force acts on the surface of the member in a parallel direction. It changes the shape of the member. For a beam, the shear stress is maximum at the neutral axis.

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3 years ago

What is the concept of time and reality itself

Lostsunrise [7]

Time is an illusion time is the progression of from the past to the present into the future.

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3 years ago

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