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Model Papers
(i) A stone is dropped into a quite lake and waves move in circles at the speed of 5 cm/s. At the instant when the radius of circular wave is 8cm, how fast is the enclosed area increasing?
cbse
class12
modelpaper
2012
sec-c
q28
math
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asked
Jan 23, 2013
by
thanvigandhi_1
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A stone is dropped into a quiet lake and waves move in circles at the speed of $5 \;cm/s$. At the instant when the radius of the circular wave is $8 \;cm$, how fast is the enclosed area increasing?
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