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The volume of sphere is increasing at the rate of 1200c.cm/sec. the rate increase in its surface area when the radius is 10cm is

9 years ago

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Steve
dv/dt = 4πr^2 dr/dt
da/dt = 8πr dr/dt

(dv/dt)/(da/dt) = r/2
so, when r=10, da/dt = 240 cm^2/s
9 years ago

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