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3 years ago

When did betsy ross start school

Social Studies

1 answer:

RUDIKE [14]3 years ago

6 0

<span>Betsy went to a Friends (Quaker) public school. please make my answer the brainliest</span>

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Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years. By

attashe74 [19]

Answer:

The rock is 3.75 billion years ago.

Explanation:

Given that:

Half life = 1.25 billion years

1 billion years = 10⁹ years

So,

Half life = 1.25 × 10⁹ years

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac {ln\ 2}{1.25\times 10^9}\ year^{-1}$

The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹

Initial amount [A₀] = 80 micrograms

Final amount $[A_t]$ = 10 micrograms

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

So,

$10=80\times e^{-5.5452\times 10^{-10}\times t}$

$80e^{-5.5452\times \:10^{-10}x}=10$

$\frac{80e^{-5.5452\times \:10^{-10}x}}{80}=\frac{10}{80}$

$\ln \left(e^{-5.5452\times \:10^{-10}x}\right)=\ln \left(\frac{1}{8}\right)$

$x=\frac{10^{10}\times \:3\ln \left(2\right)}{5.5452}=3.75\times 10^9$

So,

<u>The rock is 3.75 billion years ago.</u>

8 0

3 years ago

After unified China why did she wanted to buy the clutch it's a military districts

galina1969 [7]

Ree times ? wow .... you reallly need help

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2 years ago

Why do you think King George III rejected the Olive Branch Petition?

Gekata [30.6K]

Answer:When George III refused to read the petition, many Americans realized that Parliament was acting with royal knowledge and support.

Explanation: because they he realized that they were acting with the parliament

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2 years ago

Read 2 more answers

Which phrase defines Jim Crow?

Vinvika [58]

Answif

a Jim crow law is any law that discriminates against a race

Explanation:

say 2 people of 2 different colors or gender or race do the same job one gets paid 12 and hour one gets paid 9 an hour that is discrimination because you are paying 2 different pays for the same job

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2 years ago

What role did the house of burgessess play in the king’s privy council

dybincka [34]

Essentially they represented the King and his opinions/ values, they made recommendations that they thought the King would approve of.

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2 years ago