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versaceblooper
14.02.2021 •
Mathematics
How much charge is needed to repel another charge of 9.9 x 10^-6 N when they are 200m apart? Please help meee I really can't understand Coulomb's Law : (
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Ответ:
The charge needed will be![q=6.6\: \mu C](/tpl/images/1118/8040/78545.png)
Step-by-step explanation:
The equation of the electric force is given by:
We have the force
and the distance r = 200. k is the Coulomb constant. Q and q are the charges.
We assume we have the same charge of the particles, so we have:
Therefore, the charge needed will be![q=6.6\: \mu C](/tpl/images/1118/8040/78545.png)
I hope it helps you!
Ответ:
$98.9.
Step-by-step explanation:
1. We reduce the original price by 20%.
That is $115 - ($115*0.2)=$92
2. We add 7.5% tax on the discounted price to get the final price.
$92+($92*.075)=$98.9
Final price is $98.9