[1958325146]

Imagine cutting a cylinder in half from top to bottom, then taping the halves back together. As you spin it, the tape has to stop the two halves from flying apart. If you make the cylinder bigger and keep the centripetal acceleration the same, the tape has a harder job do because it has heavier things trying to fly apart.

Every strip of the cylinder has to keep the opposing halves from flying apart. For a big enough cylinder, the material will not be strong enough. You can make the cylinder walls thicker, but now you've made the flying-apart halves heavier too.

[tln]

But if you just consider equal size strips, with the larger cylinder just having more of them, then the force on each will be the same... unless you're saying the imaginary tape have to deal with forces from other strips. I don't see why