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Q.

The volume of a metal hollow sphere is constant. If the outer radius is increasing at the rate of 1/4 cm/sec. The rate at which the inner radius is increasing when the radii are 8cm and 4cm respectively is

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a

2cm/sec

b

1cm/sec

c

4cm/sec

d

3cm/sec

answer is D.

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Detailed Solution

dr2dt=14    r2=8  r1=4 43π r23-43πr13=k r23-r13=3k4π3r22dr2dt-3r13dr1dt=0 64×14-16dr1dt=0dr1dt=1

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