Question

the force attraction(F) between two opposite electrical charges varies inversely as the square of the distance (d) between them. If F=18 when d=10 find F when D=15?

Answer 1

"the force attraction(F) between two opposite electrical charges varies inversely as the square of the distance (d) between them"\[
F(d) = \frac{c}{d^2}
\]

Answer 2

wio, do u have any hint besides that?

Answer 3

" If F=18 when d=10"

What do you think this would be written as?

Answer 4

18(10)=c/d^2?

Answer 5

Nope. It's \[
F(10)=18
\]

Answer 6

You're misunderstand function notation.

Answer 7

i cannot understand it sir? :(

Answer 8

Well, for example... When you have \(f(x)\), and I say \(f=6\)... you can't do this: \[
f(x) \to 6(x)
\]That's not how it works.

Answer 9

i know it sir :) but i cant just answer this... i dont know the answer :(

Answer 10

They told you that \[
F(d) = \frac{c}{d^2} \\
F(10)= 18
\]And they want \(F(15)\).
Does that make it clear?

Answer 11

if u need the answer just then its F2 =F1 *d1*d1 /(d2*d2)=18 *10*10/(15*15) = 8