Physics

posted by Gail

A compact disc spins at 2.7 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 2.6 cm from the CD's center. (a) What is the coefficient of friction between the ant and the CD?

  1. Elena

    n=2.7 rev/s => ω=2πn=2•3.14•2.7 ≈17 rad/s
    ma=F(fr)
    mω²R=μmg
    μ=ω²R/g =17²•0.026/9.8 =0.77

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