A flywheel for energy storage is modeled as a rotating thin-walled cylindrical ring \((t

the kinetic energy stored per unit mass of a ring made from 4340 steel with that of a ring made from IM-7 carbon fibers. For the carbon fiber ring, assume that the fibers are oriented in the circumferential direction, and that the entire tensile load is supported by the fibers.

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FIGURE 1.46 Simplified model of flywheel for Problem 9. r