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horsena [70]
3 years ago
11

The actual matter density of the universe, accounting for all of the luminous matter and all of the dark matter known to exist i

n galaxies and clusters, is what fraction of the critical density?
Social Studies
1 answer:
goldfiish [28.3K]3 years ago
5 0

Answer:  The correct answer is :  The critical density for the universe is approximately 10 ^ -26 kg / m ^ 3 or you can also say 10 hydrogen atoms per cubic meter.

Explanation:  This value is given by:

critical density = 3H ^ 2/2 Pi G, where H is the Hubble constant and G is Newton's gravitational constant.

Critical density is the average density of matter necessary for the universe to stop its expansion but after an infinite time.

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A Young Man Is Cleaning His Ear by Sliding a Cotton Swab into the External Acoustic Meatus as Far as He Can. He Is Met with Some
hodyreva [135]

Answer:

ear drum

Explanation:

i think he pushed the cottan swab thrugh his ear drum thus causing the ringing

6 0
2 years ago
The Acme Chemical Company has some employees who work in a production plant and some who work in a sales office. The plant worke
zvonat [6]

Answer:

Fixed interval, fixed ratio

Explanation:

<u>Fixed interval schedule: </u>

The main motto of the reinforcement schedule is to motivate the behavior. In a fixed interval of time, the behavior is motivated after passing a fixed time but the interval of time is always fixed.  

For example, the behavior is reinforced after 5 seconds, the second reinforced will be given after 5 seconds when the response does not occur.  

<u>Fixed ratio schedules: </u>

In this schedule, the behavior is reinforced after a certain fixed response. This schedule contains a fixed number of responses.  

For example, if a rat is pressing the lever but if rat pressing the lever 7 times then will get reinforcement that is fixed ratio schedule.

3 0
3 years ago
In Audrey Flack’s Marilyn Monroe, the burning candle, the flower, and the hourglass are typical of a kind of symbolism in the ar
slamgirl [31]

Answer:

Vanitas

Explanation:

The symbolism used in Audrey Flack's Marilyn Monroe is called as Vanitas.

Vanitas can be demonstrated as a symbolic art work which shows the temporariness of life, certainty of the death, the purposelessness of delight, frequently differentiating images of riches and images of ephemerality and demise.

The art of Vanitas includes different symbols like skull, jewels,books of knowledge, etc.

8 0
3 years ago
The Song Dynasty was plagued by
butalik [34]
I found that its not any of them i soory there was snowand high winds
7 0
3 years ago
Most countries in Africa have a government with a strong central authority. Local governments- like cities, counties, states, or
Ugo [173]
The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Most African countries have Unitary form of government. 

A unitary state is a state governed as a single power in which the central government<span> is ultimately supreme and any administrative divisions (sub-national units) exercise only powers that the central </span>government chooses to delegate. The majority of states in the world have a unitary system of government<span>.
</span>
I hope my answer has come to your help. Thank you for posting your question here in Brainly.

5 0
3 years ago
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