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3 years ago

Which of these best describe the chemical composition of asteroids? Select all that apply.

Physics

1 answer:

romanna [79]3 years ago

3 0

Hydrogen because it's a chemical

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Why is cloning done before an investigation begins??

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Answer:Purpose of Cloning

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Explanation:

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3 years ago

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3 years ago

Which statement describes the effects of forces on an object

lukranit [14]

Answer:

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Explanation:

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3 years ago

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Vesnalui [34]

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3 years ago

Read 2 more answers

The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 1% per day. A s

Bumek [7]

Answer:

2,38kg

Explanation:

Mass in function of time can be found by the formula: $m_{(t)} =m_{0} e^{-kt}$ , where $m_{0}$ is the initial mass, t is the time and k is a constant.

Given that a sample decay 1% per day, that means that after first day you have 99% of mass.

$m_{(1)} =m_{0} e^{-k(1)}$ , but $m_{(1)}=\frac{99m_{0} }{100}$ , so we have $\frac{99m_{0} }{100}=m_{0}e^{-k}$ , then $k=-ln(\frac{99}{100})=0.01$

Now using k found we must to find $m_{(5)}$ .

$m_{(5)}=m_{0}e^{-(0.01)5}=2.5kge^{-0.05} =2.5x0.951=2.38kg$

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3 years ago