- #1

chwala

Gold Member

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- Homework Statement
- see attached.

- Relevant Equations
- rate of change

My approach is as follows;

##\dfrac{dr}{dt}=\dfrac{dr}{da}⋅\dfrac{da}{dt}##

##\dfrac{dr}{da}=\dfrac{1}{2πr}##

##\dfrac{dr}{dt}=\dfrac{1}{2πr}⋅15##

##\dfrac{dr}{dt}=\dfrac{7.5}{πr}##

and noting that ##r= \sqrt{\dfrac {50}{π}}##

##\dfrac{dr}{dt}=\dfrac{7.5}{12.533}=0.598## cm/s

*kindly note that i do not have the solutions ..

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