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Snezhnost [94]
3 years ago
5

.

Chemistry
2 answers:
8090 [49]3 years ago
7 0

Answer:This is to you! you are a brilliant and sweet person. you are loved by many. if you send this out to 15 people in the next hour you will have the best of luck for a year. if you send it to 30 people in the next year than your crush will ask you out soon. Don't break the chain or you will have 7 years of bad luck. go!

A: Love

B:Because your bored

C: Sad

D:Mad

Don't judge people for their beliefs. I'm watching...

Thank you for listening. Take care, and NEVER GIVE UP!

Explanation:

When it stops and when it is going down

Leokris [45]3 years ago
5 0
It would have potential energy because it has the potential to be falling at a faster rate. There are things that factor in such as falling speed and gravity as well which gives it the potential to fall at a faster rate. It also has kinetic energy because it is already in the motion of Falling down so it has that energy that would be the impact when it hits the ground. It can have both at the same time because it is already in motion with kinetic energy and it has the potential to fall at a faster rate.
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A sample of polonium-210 has an initial mass of 321 milligrams (mg). If the half-life of polonium-210 is 138 days, how many mg o
raketka [301]

Hey there!

A half-life means after a certain amount of time, half of that substance will have decayed after that time.

An equation for exponential decay is the following:

y = a(1 - b)ⁿ

Where a is the original amount, b is the rate of decay, and n is time.

1000 is about 0.3 of a half life, 1000 divided by 138 days (3312 hours) is approximately 0.3.

Let's plug in values to that equation:

y = 321(1 - 0.5)^(0.3)

Simplify.

y = 260.73

There will be 260.73mg of polonium-210 remaining after 1000 hours.

Hope this helps!

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