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2 years ago

6

Here is a question Brainlessis on the line:

1 answer:

Vikki [24]2 years ago

5 0

Answer:

The leading theory, however, as to the “why” of “say cheese” is that the “ch” sound causes one to position the teeth just so, and the long “ee” sound parts their lips, forming something close to a smile. ... It's a formula for smiling when you have your picture taken.

none hehehee

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C i thins your answer is

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3 years ago

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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.

4 0

3 years ago

Name and discuss two way in which a student can pay for his or her studies if their parents can't afford it?

Kamila [148]

Answer:

Fill out the FAFSA. ...

Search for scholarships. ...

Choose an affordable school. ...

Use grants if you qualify. ...

Get a work-study job. ...

Tap your savings. ...

Take out federal loans if you have to. ...

<h3>Borrow private loans as a last </h3>

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2 years ago

Who is known as missile man of india give answer by not searching on google

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Explanation:

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3 years ago

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Ostrovityanka [42]

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it lets you visually see where a place is exactly instead of on a piece of paper and you can see the whole world at once and keep a mental image

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3 years ago