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Debora [2.8K]
3 years ago
15

Please help for 21! will mark brainliest

Physics
1 answer:
Katyanochek1 [597]3 years ago
5 0

The answer for this question is D

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All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39. How
nydimaria [60]
For atoms in the periodic table, the given mass number is the sum of the number of the protons (also called the atomic number) and the number of the neutrons inside its nucleus. Mathematically,
                              mass number = atomic number + number of neutrons
Substituting,
                               39 = 19  + n
                                    n = 39 - 19 = 20
Therefore, the answer is not found in the choices. 
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Is 1 milliliter/second a small or large flow? Why?
ozzi

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1 ml/second is a small flow

Explanation:

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What do you think we can learn about Earth's history by looking at the Grand Canyon?
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A projectile is launched at an angle of 60 degrees to the horizontal at an initial speed of 10 meters per second. What is the ma
Flura [38]

Answer:

5 sq. root 3

Explanation:

theta= 60°

=> u sin theta = 10 × sin 60

= 10× sq. root 3/2

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Um comentarista de futebol certa vez comentou:"A bola bateu na trave e voltou duas vezes mais forte". Sabendo que quando a bola
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