Question 766117
The speed of a belt is given by the formula ' V = Pi dn ', where V is the speed of the belt in metres per minute, d the diameter of the pulley in metres and n the number of revolutions per minute. A machine belt runs at 400 metres per minute over a pulley running at 200 rpm. What is the diameter of the pulley? 
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V=&#960;dn
d=V/&#960;n
{{{d=(400)/(pi*200)=2/pi}}}=0.64 m