I am almost 100% positive the answer is A.
Answer:
1020 km
Explanation:
A complete rotation of the wheel equals a distance of 1 circumference.
The circumference is
where <em>d</em> is the diameter of the wheel.
300,000 rotations =
In kilometers, this is = 1017876/1000 km = 1020 km
#3). The wavelengths of the four types of electromagnetic
radiation on that list line up like this:
Longest ... microwaves
next . . . . . infrared waves
next . . . . . visible light waves
shortest ... ultraviolet waves
#4). The word "visible" means "able to be seen". Infrared
light and ultraviolet light are not visible to human eyes.
D. MgF₂
Explanation:
The compound that is held together by the electrostatic force between two ions is MgF₂.
Electrostatic force of attraction is exhibited primarily and only in ionic compounds.
In this type of bond;
- A metallic atom such as Mg will lose two of its valence electrons to form Mg²⁺
- Two non-metal ion that is highly electronegative such as "F" will gain the two electrons because they require an electron each to have a perfect octet.
- Two ions are now formed.
- In the vicinity of one another, they attract with an electrostatic force.
- This is why our answer is MgF₂.
- Electrostatic force occurs in ionic/electrovalent compounds
learn more:
Ionic bond brainly.com/question/10826758
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