Can anyone help me with this resistance problem? Total Resistance in a series = R1+R2+... Using this principle, estimate the resistance of a cylindrical aluminum block (resistivity = 2.65 x 10^-8 ohm-meter)that has a radius w/c lineary increases from 5cm to 10 cm. Then divide block into 3 cylinders w/ equal thickness and uniform radius. State how you assumed the radii of the 3 cylinders. If the 3 cylinders are cut to very thin disks, the resistance may be calculated w/ an integral. Set-up the integral.