Question 567594
P is inversely proportional to {{{d^2}}}.
{{{P = k/d^2}}} Given that {{{P = 10000}}} when {{{d = o.4}}} make the substitutions:
{{{10000 = k/(0.4)^2}}} Solve for k:
{{{k = 10000(0.16)}}}
{{{k = 1600}}} so...
{{{P = 1600/d^2}}} now substitute {{{d = 0.8}}}
{{{P = 1600/(0.8)^2}}} Evaluate.
{{{P = 1600/0.64}}}
{{{P = 2500}}}