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qwelly [4]
2 years ago
12

Explain how magnets have an attractive force and repulsive force

Physics
1 answer:
shusha [124]2 years ago
7 0
The force between two parallel wires carrying currents in the same direction is attractive. It is repulsive if the currents are in opposite directions.
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An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99
sashaice [31]

<u>Answer:</u> The average atomic mass of the given element is 20.169 amu.

<u>Explanation:</u>

Average atomic mass of an element is defined as the sum of masses of the isotopes each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i     .....(1)

We are given:

  • For isotope 1:

Mass of isotope 1 = 19.99 amu

Percentage abundance of isotope 1 = 90.92 %

Fractional abundance of isotope 1 = 0.9092

  • For isotope 2:

Mass of isotope 2 = 20.99 amu

Percentage abundance of isotope 2 = 0.26%

Fractional abundance of isotope 2 = 0.0026

  • For isotope 3:

Mass of isotope 3 = 21.99 amu

Percentage abundance of isotope 3 = 8.82%

Fractional abundance of isotope 3 = 0.0882  

Putting values in equation 1, we get:

\text{Average atomic mass}=[(19.99\times 0.9092)+(20.99\times 0.0026)+(21.99\times 0.0882)]

\text{Average atomic mass}=20.169amu

Hence, the average atomic mass of the given element is 20.169 amu.

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3 years ago
What type of energy is related to mass and the speed of an object?
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An energy that is related to mass and speed would most likely be kinetic energy.
K= 1/2mv^2
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I need help on this.
4vir4ik [10]
It brings cold water from the bottom of the ocean.
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4. What are 3 things that you can think of doing, that would reduce<br> your electricity bill?
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Turn off standby appliances.
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A track begins at 0 meters and has a total distance of 100 meters. Juliet starts at the 10-meter mark while practicing for a rac
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55 meters. If she started at 10 meters and ran 45 more, 10+45=55.
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