February 1st, 2018, 11:25 AM  #1 
Newbie Joined: Feb 2018 From: south africa Posts: 3 Thanks: 0  need help
good day I 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 1st, 2018, 11:37 AM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,733 Thanks: 996 Math Focus: Elementary mathematics and beyond 
(a) What do you need to do to 750 r/min to find the number of rotations per second (r/s)? (b) Can you use that result along with the speed of the belt to answer this part? 
February 1st, 2018, 11:46 AM  #3 
Newbie Joined: Feb 2018 From: south africa Posts: 3 Thanks: 0  
February 1st, 2018, 12:41 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 18,573 Thanks: 1485 
If the pulley has diameter d and makes n revolutions per second, n × $\pi$d = 33 m.
