
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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February 26th, 2018, 12:56 PM  #1 
Newbie Joined: Feb 2018 From: south africa Posts: 4 Thanks: 0  need help a belt is driven by a pulley at 33m/s the pulley rotates at 750 r/min. calculate: (a) the rotational frequency in r/s (b) the diameter of the drive pulley 
February 26th, 2018, 01:26 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,755 Thanks: 1405 
if the rate of revolution 750 revolutions per minute and the belt speed is $v = 33 \, m/sec$ ... (a) rotational frequency in radians per second ... $\omega = \dfrac{750 \, rev}{min} \cdot \dfrac{2\pi \, rad}{rev} \cdot \dfrac{1 \, min}{60 \, sec}$ (b) $d = 2r = \dfrac{2v}{\omega}$ 