A uniform solid cylinder rolls without slipping down an incline. A hole is drilled through the cylinder along its axis. The radius of the hole is 0.50 times the (outer) radius of the cylinder.
(a) Does the cylinder take more or less time to roll down the incline now that the hole has been drilled? Explain.
(b) By what percentage does drilling the hole change the time for the cylinder to roll down the incline?