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A spherical balloon is being inflated so...

A spherical balloon is being inflated so that ists volume increases uniformal at the rate of 40 `cm^(3)//min.`
At `r=8,` its surface area increase at the rate

A

`10 cm^(2)` minute

B

`20 cm^(2)` minute

C

`40 cm^(2)` minute

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-DERIVATIVE AS A RATE MEASURER -Exercise
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  14. A circular metal plate is heated so that its radius increases at a rat...

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  15. The distances moved by a particle in time t seconds is given by s=t^(3...

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  16. If s=e^(t) (sin t - cos t) is the equation of motion of a moving parti...

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  19. The edge of a cube is equal to the radius o the sphere. If the rate at...

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  20. The side of an equilateral triangle is 'a' units and is increasing at ...

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