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Kelsie Sawayn

Feb 20, 2025

A ceiling fan with 89-cm-diameter blades is turning at 64 rpm .?

Suppose the fan coasts to a stop 25 seconds after being turned off. a) What is the speed of the tip of a blade 10 seconds after the fan is turned off? b) Through how many revolutions does the fan turn while stopping?
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2 Answers

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Madie Hilpert

Feb 20, 2025

r = 0.89/2m= 0.445m; t =25; v=0; u=64 rpm = 64* 2*pi /60 = 6.7 rad/sv =u+at0 = 6.7 + 25 aa = - 0.268 rad/s2a) v = u +at v = 6.7 - 0.268 * 10v = 4.02 rad/sspeed of the tip of a blade = 0.445 * 4.02 = 1.789m/s --answerb) s = ut + 0.5 at^2s = 6.7 * 25 - 0.5 * 0.268* 25^2s = 83.75rad= 13.33 revanswerrevolutions the fan turned while stopping... Show More
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Hermina Ferry

Feb 20, 2025

It depends on whether the fan is decelerating at a constant rate."Coasts" is a very vague term.... Show More
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