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1 year ago

What is unusual about the results of mass determinations of clusters of galaxies?

2 answers:

7 0

Galaxy clusters are the most recent, gravitationally bound products of the hierarchical mass accretion over cosmological scales. There is much more mass than can be accounted for by the visible galaxies.

The mass measurement of galaxy clusters is an important tool for the determination of cosmological parameters describing the matter and energy content of the Universe. However, the standard methods rely on various assumptions about the shape or the level of equilibrium of the cluster.

Learn more about Galaxy clusters here:

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Art [367]1 year ago

3 0

Answer:

I think it's bigger than most galaxies

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A parallel plate capacitor is connected to a battery that maintains a constant potential difference between the plates. If the p

Svetllana [295]

Answer:

e. The amount of the charge decreases, because the capacitance decreases.

Explanation:

The capacitance of a parallel plate capacitor is given by the formula:

$C=\frac{\epsilon A}{d}$

where $\epsilon$ is the permittivity of the medium between the plates, A the area of the plates and d the separation between them, so <em>if we increase the separation d the capacitance C will decrease</em>.

The relationship between the charge on the plate Q and the voltage applied V (the potential difference between the plates) is given by:

$Q=CV$

This means that if while <em>keeping the potential difference between the plates V constant the capacitance C decreases then the charge Q will decrease as well</em>.

5 0

2 years ago

Which of the following correctly describes a longitudinal wave?

MariettaO [177]

A wave vibrating in the direction of propagation

8 0

3 years ago

Find out the x-component and y-component of the following vectors:

Leno4ka [110]

Answer:

A = 15.0 cm; the vector is 30.00 north of west; = 15 cm N30W

Y - component = 7.5cm and X - component = -12.99 cm

B = 12.0 m; the vector is 55.00 north of east; = 12.0 m N55E

Y - component = 9.83 m and X - component = 6.88 m

C = 28.0 m/s; the vector is 40.00 south of west; = 28.0 m/s S40W

Y - component = - 17.998 m/s and X - component = - 21.448 m/s

D = 55.5 m/s2; the vector is 35.00 south of east; = 55.5 m/s² S35E

Y - component = - 31.835 m/s² and X - component = 45.466 m/s²

Explanation:

1. A = 15.0 cm; the vector is 30.00 north of west; = 15 cm N30W

Y - component = 15cm × sin30 = 7.5cm

X - component = -15cm × cos30 = -12.99 cm

2. B = 12.0 m; the vector is 55.00 north of east; = 12.0 m N55E

Y - component = 12.0 m × sin55 = 9.83 m

X - component =12.0 m × cos55 = 6.88 m

3. C = 28.0 m/s; the vector is 40.00 south of west; = 28.0 m/s S40W

Y - component = - 28.0 m/s × sin40 = - 17.998 m/s

X - component = - 28.0 m/s × cos40 = - 21.448 m/s

4. D = 55.5 m/s2; the vector is 35.00 south of east; = 55.5 m/s² S35E

Y - component = - 55.5 m/s² × sin35 = - 31.835 m/s²

X - component = 55.5 m/s² × cos35 = 45.466 m/s²

6 0

2 years ago

Read 2 more answers

Which statement accurately describes the illustration?

Elina [12.6K]

Answer: A. Hydrogen has a valence of 1 and Oxygen has a valence of 8.

Explanation:

Meaning that oxygen has 8 valence electrons in its outer shell and hydrogen has 1 valence electron in its outer shell

8 0

3 years ago

Read 2 more answers

Light waves and sound waves have many similar behaviors, such as reflection and refraction. One behavior they do not share is

Leto [7]

Answer:

light waves can travel in vacuum but sound waves require a medium to travel

also light waves are electromagnetic waves while sound waves are mechanical, light waves are transverse waves while sound waves are longitudinal waves

8 0

1 year ago