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A disk with radius R has mass per unit area that depends on the radius as dm/dA = α/r for 0 < r ≤ R with α positive and constant. What is the mass of the disk?
[b] 1/3 παR3
[d] α ln R
[e] 2 παR
A non-uniform rod rotates about an axis through one end of the rod, perpendicu...
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