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Physics(Please help)

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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,

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

  • Physics(Please help) -

    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,

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