Originally posted by: fyleow
Originally posted by: vtqanh
Surface area, (ignoring the surface at the end of the cable) S=2*pi*radius*height or S=2*pi*r*h
dS/dt = 2*pi**h*dr/dt
dr/dt = (dS/dt)/(2*pi*h) = 750/(2*3.14*1200) (100 ft = 1200 inches) ~ 0.0995 in^2/yr
That's the radius, the diameter is gonna increase two times as fast, thus, 0.199
Ok, that's right. Have time for another question? (Practice test, not homework btw)