Some bacteria are propelled by biological motors that spinhair-like flagella. A

Question

Some bacteria are propelled by biological motors that spinhair-like flagella. A typical bacterial motor turning at a constantangular velocity has a radius of 1.23 *10-8 m, and a tangential speed at the rimof 2.22 * 10-5m/s. (a) What is the angular speed (the magnitude ofthe angular velocity) of this bacterial motor?
1 rad/s

(b) How long does it take the motor to make one revolution?
2 s (a) What is the angular speed (the magnitude ofthe angular velocity) of this bacterial motor?
1 rad/s

(b) How long does it take the motor to make one revolution?
2 s

Explanation / Answer

a) What is the angular speed(the magnitude of the angular velocity)of this bacterial motor?(rad/s)
tangential speed v=rw
angular speedw=v/r=2.22*10-5/1.23*10-8=1804.8 rad/sec
b) How long does is take the motor to make one revolution?

time period=2/w=6.28/1804.8=0.0034sec

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