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3 years ago

Oxygen levels first rose in the atmosphere because of _____.

Physics

2 answers:

tigry1 [53]3 years ago

5 0

<u>The answer to your question is going to be option "D."</u>

Oxygen levels first rose in the atmosphere because of (the last option, or "D') cyanobacteria. Cyanobacteria is a type of bacteria that can create toxins that are very dangerous to both humans and animals.

I hope this helps! :)

Umnica [9.8K]3 years ago

3 0

Hey there!

Your answer = D. Cyanobacteria

They gain their energy through the photosynthesis.

Hope this helped!

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The water behind Grand Coulee Dam is 1000 m wide and 200 m deep. Find the hydrostatic force on the back of the dam. (Hint: the t

Vika [28.1K]

Answer:

The hydro static force on the back of the dam is $1.96\times10^{11}\ N$

Explanation:

Given that,

Width b= 1000 m

Depth d= 200 m

We need to calculate the average pressure

Using formula of average pressure

$P_{avg}=\rho\times g\times d_{avg}$

Put the value into the formula

$P_{avg}=1000\times9.8\times100$

$P_{avg}=980000\ Pa$

We need to calculate the hydro static force on the back of the dam

Using formula of force

$F = P_{avg}\times A$

Put the value into the formula

$F = 980000\times1000\times200$

$F=1.96\times10^{11}\ N$

Hence, The hydro static force on the back of the dam is $1.96\times10^{11}\ N$

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3 years ago

What items resemble the path of light when it travels through space?

777dan777 [17]

Laser light. I suppose..

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3 years ago

Làm thế mào để kiểm tra một lục ma sát trược

9966 [12]

C I completed the same quiz

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3 years ago

A sock with a mass of 0.03 kg is stuck to the inside of a clothes dryer spins

ValentinkaMS [17]

Answer:

15.71 m/s

Explanation:

We are given;

Time; t = 0.2 s

Radius; r = 0.5 m

The circumference will give us the distance covered.

Formula for circumference is 2πr

Thus; Distance = 2πr = 2 × π × 0.5 = π

Linear speed = distance/time = π/0.2 = 15.71 m/s

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4 years ago

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labwork [276]

Answer:

Explanation:

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2 years ago