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Ppou li one year? log2 [Use e 1990 = 0.99961 14. A spherical raindrop evaporates at a rate proportional to its surface area. If originally its radine be 3 mm and 1 hour later it reduces to 2 mm, find an expression for the radius of the raindrop at any time. 15. An equation relating to stability of an ulu . . dv

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