Question

A is inversely proportional to the square of r.
A=5 when r=0.3
(a) Find a formula for A in terms of r

Answer 1

Answer:

A ∝ 1/r^2

A.r^2 = k --> 1 ,for some constant k

given, A=5 when r=0.3; subbing in 1 we get,

5×0.09=k

k=0.45

thus the formula for A in terms of R will be;

A=k/r^2 --> from 1

A= 0.45 / r^2

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