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ra1l [238]
2 years ago
9

How much water makes up earth in percentages? thx?

Physics
1 answer:
Bond [772]2 years ago
7 0

Answer:

71%

Explanation:

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The Sun's surface temperature is closest to _____.
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two electrons are an angstrom (1x10^-10m) apart. What electrostatic force do they exert on one another?
Irina-Kira [14]

Answer:

2.30 × 10⁻⁸ N if the two electrons are in a vacuum.

Explanation:

The Coulomb's Law gives the size of the electrostatic force F between two charged objects:

\displaystyle F = -\frac{k\cdot q_1 \cdot q_2}{r^{2}},

where

  • k is coulomb's constant. k = 8.99\times 10^{8}\;\text{N}\cdot\text{m}^{2}\cdot\text{C}^{-2} in vacuum.
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For the two electrons:

  • q_1 = q_2 = 1.60\times 10^{-19}\;\text{C}.
  • r = 1\times 10^{-10}\;\text{m}.
  • \displaystyle F = -\frac{k\cdot q_1 \cdot q_2}{r^{2}} = -\frac{8.99\times 10^{8}\times (1.60\times 10^{-19})^{2}}{(1\times 10^{-10})^{2}} = 2.30\times 10^{-8}\;\text{N}.

The sign of F is negative. In other words, the two electrons repel each other since the signs of their charges are the same.

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Many television sets show 25 images, called 'frames, each second. What is the time interval between one
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Answer:

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We can simply solve this numerical problem by using the following process.

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To calculate the time interval between one frame and next, we need to divide the time taken to display total number of frames by total number of frames.

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= Time taken to display total number of frames / Total frames

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