Question
Help me find the name and page number of the texbook these questions came from and you'll earn 300pts. Easy... First answer gets points. Hint: It could come from either a college level physics text book or an engineering dynamics text book. Thanks
A flywheel from a piece of machinery is in the shape of a solid disc with 6 holes in it. The flywheel with holes has radius R=0.50m, thickness 0.01m, and total mass M=10kg. Each hole has a radius 0.05m and is centered 0.25m from the flywheel axis (see drawing). Determine the moment of inertia 1 for the flywheel B387 rotated about its axis. A dumbell, consisting of two "point" masses (each of mass M) connected by a rigid massless rod of length L, rotates freely at angular velocity wj about a centered normal axis on a frictionless pivot. Just as the dumbell comes into position, two spiders (each of mass m) drop simultaneously a very short distance vertically from their spider web perches onto the masses and grab hold. The dumbell (with spiders) continues to rotate, but with a (perhaps different) angular velocity omega f. Determine omega f. Determine the kinetic energy of the system (dumbell + spiders) before and after the spiders grab hold. You may assume that the spiders are essentially at rest just as they grab hold (but do not assume they have zero kinetic energy after they grab hold). Is the final kinetic energy larger or smaller than the initial kinetic energy? The spiders, in a new coordinated effort, now simultaneously crawl radially inward along the rod. Determine m for the rotating system as a function of radial position r for the spiders. Note that r ranges from L/2 to 0.
Explanation / Answer
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