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A 24.73 kg shaft with a radius of 8.1 cm is spinning at a rate of 852.8 rpm. If a board leans against the outside providing a frictional force of 26.69 N, how long will it take for the shaft to stop rotating?

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A 12.8 kg shaft with a radius of 4.2 cm is spinning at a rate of 869.3 rpm. If a board leans against the outside providing a frictional force of 54.04 N, how long will it take for the shaft to stop rotating?

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A 15.63 kg shaft with a radius of 4.8 cm is spinning at a rate of 614.5 rpm. If a board leans against the outside providing a frictional force of 47.51 N, how long will it take for the shaft to stop rotating?

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A 11.38 kg shaft with a radius of 5.2 cm is spinning at a rate of 772.5 rpm. If a board leans against the outside providing a frictional force of 21.22 N, how long will it take for the shaft to stop rotating?

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A 26.64 kg shaft with a radius of 5.7 cm is spinning at a rate of 845.9 rpm. If a board leans against the outside providing a frictional force of 58.34 N, how long will it take for the shaft to stop rotating?

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A 15.17 kg shaft with a radius of 5.6 cm is spinning at a rate of 526.5 rpm. If a board leans against the outside providing a frictional force of 38.47 N, how long will it take for the shaft to stop rotating?

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