A stone is dropped into a quiet lake and...

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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The correct Answer is:

`80 pi cm^(2)//s`

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NCERT BANGLISH-APPLICATION OF DERIVATIVES-EXERCISE 6.1

Find the rate of change of the area of a circle with respect to its ra...
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The volume of a cube is increasing at the rate of 8 cm^(3) /s. How fas...
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The radius of a circle is increasing uniformly at the rate of 3 cm/s. ...
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An edge of a variable cube is increasing at the rate of 3 cm/s. How fa...
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A stone is dropped into a quiet lake and waves move in circles at the ...
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The radius of a circle is increasing at the rate of 0.7 cm/s. What is ...
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