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January 25, 2015

January 25, 2015

Posted by **Mark** on Thursday, March 14, 2013 at 2:13pm.

my answer is 45 cm/min.

is this right. thanks

- Word Problem-Calculus-Already Solved-Please check? -
**Mark**, Thursday, March 14, 2013 at 2:50pmThank you!

- Word Problem-Calculus -
**Steve**, Thursday, March 14, 2013 at 3:23pmway off.

First, volume is cm^3

v = 4/3 pi r^3

dv/dt = 4 pi r^2 dr/dt

at t=5, r=15 so

dv/dt = 4 pi * 225 * 3 = 2700 pi cm^3/min

How did you come up with 45? Way small, and I'd surely expect a pi to appear somewhere in any problem involving a sphere.

- Word Problem-Calculus -
**Mark**, Thursday, March 14, 2013 at 3:51pmMy fault lied in plugging in directly. Thank you for showing me the steps.

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