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Zepler [3.9K]
2 years ago
13

True or False: There is the same amount of water on earth today as there was when earth was formed.

Physics
1 answer:
Nataliya [291]2 years ago
4 0

Answer:

Yes the water amounts are the same.

Explanation:

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What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 85.0% absorbed, puts 470 J of energy
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Answer:

26036485.6433 W/m²

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I=\dfrac{P}{\pi r^2}\\\Rightarrow 0.85I=\dfrac{E}{t\dfrac{\pi}{4} d^2}\\\Rightarrow I=\dfrac{470}{0.85\times 4\times \dfrac{\pi}{4}\times (2.6\times 10^{-3})^2}\\\Rightarrow I=26036485.6433\ W/m^2

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3 years ago
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