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3 years ago

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suppose it takes 500 years to form 2 cm of new soil without erosion. Of a farmer need at least 35 cm of soil to plant a particul

ar crop, how many years will the farmer need to wait before planting his or her crop? Please show how you get to the answer.?

1 answer:

Bumek [7]3 years ago

6 0

Divide 35 by 2 which is 17.5 and then multiply that number by 500 which will be 8, 750.

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Mass is the only remaining thing you need to know

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3 years ago

Read 2 more answers

Distinguish between atoms and molecules,

Lisa [10]

An atom is the smallest particle of an element which can take part in a chemical reaction

A molecule is the smallest particle of a substance that can normally exist alone and still retain the chemical properties of that substance, Be it an element or a compound.

Isotopic mass is the mass of an isotope of an element

Atomic mass is the mass of an atom.The relative atomic mass,A of an element is the number of times the average mass of one atom of that element is heavier than one-twelfth the mass of one atom of carbon-12

Molecular mass is the mass of a given molecule. The relative molecular mass,M, of an element or a compound is the number of times the average mass of one molecule of it is heavier than one-twelfth the mass of one atom of carbon-12

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3 years ago

Light travels 300 000 000 m/s and one year has approximately 32 000 000 second a light year is the distance light travels in one

Lelu [443]

Explanation:

It is given that,

Speed of light, $v=300 000 000\ m/s=3\times 10^8\ m/s$

Seconds in 1 year, $t=32 000 000=32\times 10^6\ s$

We need to find the distance traveled by light in one year. Speed of an object is given by :

$v=\dfrac{d}{t}$

So,

$d=v\times t\\\\d=3\times 10^8\times 32\times 10^6\\\\d=9.6\times 10^{15}\ m$

Since,

$1\ \text{light year}=9.46\times 10^{15}\ m\\\\1\ m=\dfrac{1}{9.46\times 10^{15}}\ \text{ly}\\\\9.6\times 10^{15}\ m=\dfrac{9.6\times 10^{15}}{9.46\times 10^{15}}\\\\d=1.01\ \text{ly}$

So, the distance covered by light is 1.01 light years.

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2 years ago

Pleaseeeee help!!!!!!!!

Ainat [17]

I did it last year. I thinks its A

5 0

3 years ago

Looking across period 4 of the periodic table, potassium (atomic number 19) is followed by calcium (atomic number 20), which is

timurjin [86]

Answer:

A. potassium

Explanation:

Potassium is expected to have the greater atomic radius from the given choices of element.

Atomic radius is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid states of metals.

Across a period, the atomic radii decreases progressively from left to right.
This is due to the progressive increase in the nuclear charge without increase in the number of electronic shells.

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2 years ago