Homework Help: trig

Posted by b on Thursday, September 1, 2011 at 12:35pm.

a propeller turns at 300 rpm. Find the angular speed in rad/sec and the linear speed at the tip if the tip to the center is 30cm

trig - Reiny, Thursday, September 1, 2011 at 4:09pm
angular velocity = 300(2π) radians/minute
= 300(2π)/60 radians/sec
= 10π radians/sec

circumference = 2π(30) = 60π cm

so the linear velocity at the tip is 300(60π) cm/min
= 300(60π)/60 cm/se
= 300π cm/sec
or
3π m/sec

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