A fan turns at a rate of \( 900 \mathrm{rpm} \). Find the tangential speed of the tip of a blade if the distance from the center to the tip is \( 20 \mathrm{~cm} \). A pulley of \( 5 \mathrm{~cm} \) radius, on a motor, is turning at \( 30 \mathrm{rev} / \mathrm{s} \) and slows down uniformly to \( 20 \mathrm{rev} / \mathrm{s} \) in \( 2 \mathrm{~s} \). Calculate the length of belt it winds in this time.
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\[ 900 \, \text{rpm} = \frac{900}{60} \, \text{rps} = 15 \, \text{rps} \] Show more…
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