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2 years ago

Which zone within the open-ocean zone is home to the most organisms?

Social Studies

2 answers:

andre [41]2 years ago

8 0

the answer is B surface zone

WITCHER [35]2 years ago

3 0

Answer:

B Surface

Explanation:

edge 2021

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Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years. By

attashe74 [19]

Answer:

The rock is 3.75 billion years ago.

Explanation:

Given that:

Half life = 1.25 billion years

1 billion years = 10⁹ years

So,

Half life = 1.25 × 10⁹ years

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac {ln\ 2}{1.25\times 10^9}\ year^{-1}$

The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹

Initial amount [A₀] = 80 micrograms

Final amount $[A_t]$ = 10 micrograms

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

So,

$10=80\times e^{-5.5452\times 10^{-10}\times t}$

$80e^{-5.5452\times \:10^{-10}x}=10$

$\frac{80e^{-5.5452\times \:10^{-10}x}}{80}=\frac{10}{80}$

$\ln \left(e^{-5.5452\times \:10^{-10}x}\right)=\ln \left(\frac{1}{8}\right)$

$x=\frac{10^{10}\times \:3\ln \left(2\right)}{5.5452}=3.75\times 10^9$

So,

<u>The rock is 3.75 billion years ago.</u>

8 0

3 years ago

Josh is a 17-year-old teenager who is known by his classmates as "the daredevil." Josh takes extreme risks that often threaten h

rjkz [21]

Answer: <em>Personal Fable</em>

Explanation:

From the given case/scenario, we can state that the following case tends to take place due to Josh's personal fable. Personal Fable is known as or referred to as a belief or notion which is held by several adolescents under which they are told that they are unique and special , to such an degree that not even a single life's problems or difficulties can affect them irrespective of their behavior.

3 0

2 years ago

Self tapping screws are primarily used when fastening objects to

Furkat [3]

I believe the answer is: Sheet metal

Self tapping screws are made by creating a gap in the connector within the thread of a crew, which creates a flute and cutting edge just like what we see on tap. This makes self tapping screws able to tap their own hole in a sheet metal while normal screws can't.

7 0

3 years ago

What precedents did washington set for future presidents

Elena L [17]

Answer:

The practice of isolationism and the ability to handle political unrest.

Explanation:

One of the key notable actions by the first president of the United States, George Washington, was to stay unbiased during the French revolution, setting good exam for the U.S government to practice isolationism( A policy of staying away from political affairs of other groups) in the years to come.

During the Whiskey Rebellion, involving tax collectors and farmers (they proposed to collect taxes from), a force of about 13000 troops were assembled and dispatched by Washington to crush the resistance, establishing an idea that the federal government at any time, could handle different forms of political unrest.

4 0

3 years ago

Who won the election on 1796

puteri [66]

John Adams beat Thomas Jefferson and was inaugurated as the second President of the United States in March 1797.

7 0

2 years ago

Read 2 more answers