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harkovskaia [24]
3 years ago
9

PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST The actual subject is Science but they dont have that as a option in pick

a subject

Physics
2 answers:
mr Goodwill [35]3 years ago
8 0

Answer:

I believe it is D. Based on the point and it being Position vs. time I believe D makes the most sense. Sorry if I am wrong!

Explanation:

VLD [36.1K]3 years ago
8 0

Answer:

25/30 = 0.83

Explanation:

I took this class

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How many neutrons does element X have if its atomic number is 23 and its mass number is 90?
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Answer:

67

Explanation:

- The atomic number (Z) of an atom is equal to the number of protons in the nucleus

- The mass number (A) of an atom is equal to the sum of protons and neutrons in the nucleus

Therefore, calling p the number of protons and n the number of neutrons, for element X we have:

Z = p = 23

A = p + n = 90

Substituting p=23 into the second equation, we find the number of neutrons:

n = 90 - p = 90 - 23 = 67

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Three boards, each 50 mm thick, are nailed together to form a beam that is subjected to a 1200-N vertical shear. Knowing that th
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Answer:

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