Describe the heliocentric model of the universe

1 answer:

6 0

<span>The heliocentric model of the universe was proposed by Nicolaus Copernicus. There are numerous scientist in ancient times who try to explain what happens in the universe. He may not be the first one who proposed that what astronomical body is the center of the universe. However, he stated that the center of the universe was the sun, not the earth. And the earth revolves around it. It is in his book on the Revolutions of the Heavenly Bodies. It was only published as he lay in his deathbed. </span>

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Technician A says that the evacuation process will remove dirt and debris from the refrigerant system. Technician B says that th

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Answer: Technician B is right.

Explanation:

Evacuation process is used in refrigeration systems to remove moisture, air and non-profit condensable gases in order to achieve maximum function of the system.

vacuum pump is used to draw the sealed AC system into a vacuum. Evacuation of a refrigerant system also helps to maintain pressure, this is so as pulling a vacuum on the system is simply removing matter (mostly air and nitrogen) from inside the system so that the pressure inside drops below atmospheric pressure.

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The chemical substances in food that help maintain our body are known as what?

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Answer:

Nutrients

Explanation:

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The gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha

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Answer:

(1) passed through the foil

Explanation:

Ernest Rutherford conducted an experiment using an alpha particle emitter projected towards a gold foil and the gold foil was surrounded by a fluorescent screen which glows upon being struck by an alpha particle.

When the experiment was conducted he found that most of the alpha particles went away without any deflection (due to the empty space) glowing the fluorescent screen right at the point of from where they were emitted.

While a few were deflected at reflex angle because they were directed towards the center of the nucleus having the net effective charge as positive.

And some were acutely deflected due to the field effect of the positive charge of the proton inside the nucleus. All these conclusions were made based upon the spot of glow on the fluorescent screen.

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When there is no number in front of a chemical formula in a chemical equation, what number is understood?

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<span>The number in front is the number of molecules (or atoms) taking part in the (balanced) chemical reaction equation.</span>

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Which are the three types of mutations?

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Replication, Multiplication, and Substitution.

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