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2 years ago

Which of the following is not a way that astronomers can find how much dark matter there is in cluster of galaxies?

Physics

1 answer:

Tpy6a [65]2 years ago

6 0

Answer:

b. Observe the radio waves coming from all dark matter; from the strength of the radio waves from each cluster, estimate the amount of dark matter needed to produce them.

Explanation:

The universe is thought to be made up of 85% dark matters. Dark matter is called dark because it does not appear to interact with the electromagnetic field, which means it doesn't absorb, reflect or emit electromagnetic radiation, and is therefore difficult to detect. This means that option b is wrong since radio wave is an electromagnetic wave. Dark matter is a form of matter that makes up about a quarter of the total mass–energy density of the universe. Dark matter was theorized due a variety of astrophysical observations and gravitational effects that cannot be explained by accepted theories of gravity unless there were more matter in the universe than can be seen.

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In a college homecoming competition, eighteen students lift a sports car. While holding the car off the ground, each student exe

Nata [24]

Answer:

Explanation:

Given

Each student exert a force of $F=400 N$

Let mass of car be m

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Total force by 18 students $F=18\times 400=7200 N$

therefore weight of car $W=7200$

mass of car $m=\frac{W}{g}$

$m=\frac{7200}{9.8}=734.69 kg$

(b) $7200 N \approx 1618.624\ Pound-force$

$734.69 kg\approx 1619.71 Pounds$

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2 years ago

Determine the COP. for this thermodynamic refrigerator

Dennis_Churaev [7]

Answer:

Explanation:

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COP = QL / W

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Where, T1 be the temperature of hot reservoir, T2 be the temperature of cold reservoir.

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Murljashka [212]

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2 years ago

Which of the following is not a an example of dissipated energy?

Kaylis [27]

Which of the following is not a an example of dissipated energy?
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2 years ago

Most of the mass of the milky way exists in the form of.

Andrews [41]

Answer: Dark matter.

Explanation: Hope it helps :)

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1 year ago

Read 2 more answers