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ArbitrLikvidat [17]
3 years ago
14

Answer pls will give 20 points per person

Physics
2 answers:
LuckyWell [14K]3 years ago
7 0

Answer: question 1 is b I believe

Explanation:

every action has an opposite reaction

pogonyaev3 years ago
5 0

Answer:

Mscalculator is right it is "B" i took it on edge

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Dropping it on a hard surface. 
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A helicopter ambulance flew from one hospital to another in a straight line. The pilot had to change speed several times due to
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Explanation:

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Help with these please someone?
DIA [1.3K]

Answer:

8. 2.75·10^-4 s^-1

9. No, too much of the carbon-14 would have decayed for radiation to be detected.

Explanation:

8. The half-life of 42 minutes is 2520 seconds, so you have ...

1/2 = e^(-λt) = e^(-(2520 s)λ)

ln(1/2) = -(2520 s)λ

-ln(1/2)/(2520 s) = λ ≈ 2.75×10^-4 s^-1

___

9. Reference material on carbon-14 dating suggests the method is not useful for time periods greater than about 50,000 years. The half-life of C-14 is about 5730 years, so at 65 million years, about ...

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half-lives will have passed. Whatever carbon 14 may have existed at the time will have decayed completely to nothing after that many half-lives.

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