Posted by **Hannah** on Saturday, June 9, 2012 at 4:24pm.

Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.9x10-8m, and a tangential speed at the rim of 2.7x10-5 m/s. (a) What is the angular speed (the magnitude of the angular velocity) of this bacterial motor? (b) How long does it take the motor to make one revolution?

I do not know how to start this. Thank you!

v=ù•R, => ù=v/R,

T=2ð/ù

So is v 1.9e^-8?? I do not know what r is.

- Physics(Please help) -
**Elena**, Sunday, June 10, 2012 at 10:13am
angular speed ω.

linear speed v.

v=ω•R, => ω=v/R,

R=1.9x10-8 m,

v=2.7x10-5 m/s.

Time for 1 rev = period T,

T=2π/ω

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