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GREYUIT [131]
2 years ago
8

Which of the following is NOT one of the three keys to keeping water clean? Reduction of pollutants Effective cleanup of oil and

gasoline spills Encouraging algae growth Proper sewage treatment
Physics
2 answers:
Irina18 [472]2 years ago
6 0
"Reduction of Pollutants"

Andreyy892 years ago
6 0

Answer: Encouraging algae growth

Explanation:

Algae are tiny single celled aquatic plants which are found in colonies over the surface of water body and on the shorelines of the water body. The algal growth restricts the natural flow and circulation in the water body. If the water body consists of high concentration of phosphates and nitrogen this will lead to abundance in the algal growth. The algal bloom is likely to deteriorate the quality of freshwater as it will lead to the depletion of oxygen in the water body. This will likely to affect the aquatic food chain in the water body.

Hence, encouraging algae growth is not one of the three keys to keep water clean.

The following are the three keys which can be used to keep water clean.

Reduction of pollutants.

Effective cleanup of oil and gasoline spills.

Proper sewage treatment.

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vladimir2022 [97]

The magnitude of the friction force is 25 N

Explanation:

To solve this problem, we just have to analyze the forces acting on the block along the horizontal direction. We have:

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According to Newton's second law, the net force acting on the block in the horizontal direction must be equal to the product between the mass of the block and its acceleration:

\sum F_x = ma_x

where

m is the mass of the block

a_x is the horizontal acceleration

However, the block is moving at constant speed, so the acceleration is zero:

a_x = 0

So the equation becomes

\sum F_x = 0 (1)

The net force here is given by

\sum F_x = F cos \theta - F_f (2)

And so, by combining (1) and (2), we find the magnitude of the friction force:

F cos \theta - F_f = 0\\F_f = F cos \theta = (50)(cos 60^{\circ})=25 N

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Answer:
<span>A.) The rotation of Earth on its axis</span>
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The final volume of the gas is 144.25 L

Explanation:

For an ideal gas kept at constant pressure, the work done by the gas on the surroundings is given by

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