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Mandarinka [93]
3 years ago
11

Which of the following is the best evidence that Earth's continents were once in vastly different positions than they are today?

Physics
2 answers:
vredina [299]3 years ago
8 0

Answer:

B. Fossils of tropical plants are found in Antarctica.

Explanation:

That option is the best evidence from the given because it shows that once tropical plants and the continent that today is Antarctica were once together. There is no other form that plants could travel there.

It could have happened during the Permian Epoch when all the landmasses on Earth were together forming a supercontinent known as Pangea.

I hope this answer helps you.

4vir4ik [10]3 years ago
5 0
<span>B. Fossils of tropical plants are found in Antarctica </span>
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Two identical small metal spheres with q1 &gt; 0 and |q1| &gt; |q2| attract each other with a force of magnitude 72.1 mN when se
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1) +2.19\mu C

The electrostatic force between two charges is given by

F=k\frac{q_1 q_2}{r^2} (1)

where

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r is the separation between the charges

When the two spheres are brought in contact with each other, the charge equally redistribute among the two spheres, such that each sphere will have a charge of

\frac{Q}{2}

where Q is the total charge between the two spheres.

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F=k\frac{(\frac{Q}{2})^2}{r^2}

And since we know that

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F= 21.63 mN = 0.02163 N

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Q=2\sqrt{\frac{Fr^2}{k}}=2\sqrt{\frac{(0.02163)(1.41)^2}{8.98755\cdot 10^9}}}=4.37\cdot 10^{-6} C

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q_2 = Q-q_1

So we can rewrite eq.(1) as

F=k \frac{q_1 (Q-q_1)}{r^2}

Solving for q1,

Fr^2=k (q_1 Q-q_1^2})\\kq_1^2 -kQ q_1 +Fr^2 = 0

Since Q=4.37\cdot 10^{-6} C, we can substituting all numbers into the equation:

8.98755\cdot 10^9 q_1^2 -3.93\cdot 10^4 q_1 -0.141 = 0

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Which correspond to the values of the two charges. Therefore, the initial charge q1 on the first sphere is

q_1 = +6.70 \mu C

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