Question 134473
{{{W=Cr^(-2)}}} Start with the given equation



{{{W=C(1/r^2)}}} Rewrite {{{r^(-2)}}} as {{{1/r^2}}}



{{{W=C/r^2}}} Multiply



{{{100=C/3963^2}}} Plug in {{{W=100}}} (this is the given weight) and {{{r=3963}}} (this is the given distance from the center)



{{{100=C/15705369}}} Square 3,963 to get 15,705,369



{{{100*15705369=C}}} Multiply both sides by 15,705,369



{{{1570536900=C}}} Multiply



So the constant is {{{C=1570536900}}}