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Lostsunrise [7]
3 years ago
8

A book on a table presses downward with a force equal to the upward force exerted by the table. This is an example of Newton's__

____ law of motion.
A.SECOND
B.FIRST
C.THIRD
Chemistry
2 answers:
Vsevolod [243]3 years ago
4 0
A
Is the correct answer
Lerok [7]3 years ago
3 0

Answer:

a

Explanation:

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Chemistry an atom of strontium has at least four different isotopes. what is different between an isotope of 86sr and an isotope
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Isotopes are atoms of the same element that differ in the number of neutrons.

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86 Sr means that the mass number of this isotope is 86. Also, remember that the mass number is the number of protons plus the number of neutrons.

87 Sr means that the mass number of this isotope is 87.

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Answer: 1 neutron


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3 years ago
The variable that is observed during an experiment is called what type of variable?
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Answer:

I had the same question and I put a total lunar eclipse.

Explanation:

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