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3 years ago

I need historical science facts like a good amount of them

Geography

1 answer:

tamaranim1 [39]3 years ago

3 0

Answer:

1. There is enough DNA in the average person’s body to stretch from the sun to Pluto and back — 17 times.

2. The average human body carries ten times more bacterial cells than human cells.

3. It takes a photon up to 40,000 years to travel from the core of the sun to its surface, but only 8 minutes to travel the rest of the way to Earth.

4. At over 2,000 kilometers long, The Great Barrier Reef is the largest living structure on Earth.

5. There are 8 times as many atoms in a teaspoonful of water as there are teaspoonfuls of water in the Atlantic ocean.

Explanation:

please mark me brainliest please

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Calculate the amount, in grams, of an original 300-gram sample of radioactive isotope Potassium-40 remaining after

Aleksandr [31]

Answer:

The current amount of the Potassium-40 sample is approximately 37.521 grams.

Explanation:

The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time ( $m (t)$ ), in grams, is described below:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$ (1)

Where:

$m_{o}$ - Initial mass, in grams.

$t$ - Time, in years.

$\tau$ - Time constant, in years.

The time constant can be found from half life ( $t_{1/2}$ ), in years, described in statement:

$\tau = \frac{t_{1/2}}{\ln 2}$ (2)

If we know that $m_{o} = 300\,g$ , $t = 3.9\times 10^{9}\,yr$ and $t_{1/2} = 1.3\times 10^{9}\,yr$ , then the current amount of the sample is:

$\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}$

$\tau \approx 1.876\times 10^{9}\,yr$

$m = (300\,g)\cdot e^{-\frac{3.9\times 10^{9}\,yr}{1.876\times 10^{9}\,yr} }$

$m\approx 37.521\,g$

The current amount of the Potassium-40 sample is approximately 37.521 grams.

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3 years ago

Question 7 of 40

inessss [21]

Answer:

D. A substance, energy source, or organism used by humans

Explanation:

Its not man made like the others

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satela [25.4K]

Wen the plates bump into each other, ac earthquake occurs

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3 years ago

Which stage of the cell cycle involves the division of the cytoplasm?

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That would be B cytokinesis...best way to remember that is both have the root word cyto in them

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Where the Euphrates river is located and which countries have been involved in conflict??????

bixtya [17]

Answer:

Explanation:

The Euphrates-Tigris Basin is shared between Turkey, Syria and Iraq, with Iran comprising parts of the Tigris basin. Since the 1960s, unilateral irrigation plans altering the flows of the rivers, coupled with political tensions between the countries, have strained relations in the basin.

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3 years ago

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I need historical science facts like a good amount of them​

I need historical science facts like a good amount of them