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3 years ago

Why was there a need for negro slaves in 1559

1 answer:

3 0

There was a “need” for slaves due to the diminishing numbers of Native Americans in the New World caused by the diseases the Europeans brought over. Slaves from Africa had already been exposed to such diseases like smallpox and were immune to them making them more beneficial to European settlers.

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What is the aim of national health policy of india ?

Maurinko [17]

To achieve the highest possible level of good health and well being, through a preventive and promotive health care orientation in all development policies, and to achieve universal access tp good quality health care services.

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4 years ago

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

What region of Russia has the most tensions between Russians and ethnic groups?

valina [46]

Answer:

Chechnya

Explanation:

8 0

3 years ago

Read 2 more answers

What positive developments resulted from the conditions in china during the warring states period

olasank [31]

Answer:

The need to have better protection led to innovations in tools and weapons.

Explanation:

It began at a point when the various insignificant city-state rules of the Spring and Autumn period had been incorporated into seven significant contenders and a few insignificant enclaves. It was disturbed by two hundred years of brutality and combat. It profited from the leadership of philosophers who struggled with the king. It encountered strong guidance from feudal chiefs under the king.

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3 years ago

Regarding use of the media, spin can best be defined as

Zinaida [17]

Casting a positive light would be the correct answer

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4 years ago