Ambar Posted July 11, 2017 Share Posted July 11, 2017 A circular disc of radius 3 cm is being heated. Due to expansion, it's radius increases at the rate of 0.05 cm/s . Find the rate at which it's area is increasing when radius is 3.2 CMS Some one please explain the way this sum is done with the help of calculus Link to comment Share on other sites More sharing options...
Lord Antares Posted July 11, 2017 Share Posted July 11, 2017 This sounds like homework. We're not supposed to just give answers for homework, we're supposed to help you through it. So, if this is homework, what are your thoughts on it? Do you see a link between the numbers? Link to comment Share on other sites More sharing options...
Ambar Posted July 11, 2017 Author Share Posted July 11, 2017 (edited) Yea, it's hw I did not understand the way these sums are done though I have understood the concept of derivatives and differentiation but dese sums r totally new and different for me 2 so I wanted someone to guide me through it , yea I don't just want the answer I want the explanation or guidance so that I can answer rest of the questions myself Edited July 11, 2017 by Ambar Link to comment Share on other sites More sharing options...
Country Boy Posted July 11, 2017 Share Posted July 11, 2017 (edited) Calculus, yes, but not integration. Since [math]A= \pi r^2[/math], [math]dA= 2\pi r dr[/math]. You are told that r= 3.2 and that dr= 0.05. Edited July 11, 2017 by Country Boy Link to comment Share on other sites More sharing options...
Ambar Posted July 12, 2017 Author Share Posted July 12, 2017 Thank so much 1 Link to comment Share on other sites More sharing options...
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