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Viefleur [7K]
4 years ago
15

Which of the following best describes what we mean by the universe?

Physics
1 answer:
irina1246 [14]4 years ago
7 0

Answer:

D. The sum total of all matter and energy

Explanation:

The universe is defined as a closed system that contains all forms of energy and matter. Therefore, includes the so-called dark matter and dark energy, which make up most of the universe, since ordinary matter would only represent just over 5% of the total.

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A box with a mass of 12.5 kg sits on the floor. how high would you need to lift it for it to have a gpe of 355 j
grandymaker [24]
Gpe=mgh

355=12.5×10×h
h=355/125= 2.84m
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4 years ago
Both acids and bases produce ions when dissolved in water. Propose a way to describe what
EleoNora [17]

Answer:

See explanation

Explanation:

Acids and bases contain ions that interact with water. According to the Arrhenius definition, acids are substances that produce hydrogen ion in water while bases are substances that produce hydroxide ion in water.

The pH scale is a graphic description of the hydrogen or hydroxide ion present in a sample. Since pH= -log[H^+], the higher the pH , the lower the hydrogen ion concentration and vice versa.

Similarly, pOH= -log [OH^-] , hence the more the OH^- concentration the lower the pOH.

However pH + pOH =14.

Thus the concentration of hydrogen or hydroxide ions present determines the pH of any solution.

6 0
3 years ago
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True or False? Sometimes, substances can be added to a reaction to cause the reaction to start or speed up. These are not consid
Sphinxa [80]
The correct anwser is A true
8 0
4 years ago
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How do you think gender as a social construct affects society?
Butoxors [25]

Answer:

Discrimination

Explanation:

As a society, there are people who treat men different from women. Back in time, men got paid more. Men were more likely to get a job.

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The speed of light in air is 3.00 108m/s. If a light wave has a wavelength of 5.80 + 107m, what is its
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Its 5 because of the equation

Explanation:

Thank You Merry christmas.

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