A model train, with a mass of #7 kg#, is moving on a circular track with a radius of #6 m#. If the train's rate of revolution changes from #1/2 Hz# to #2/7 Hz#, by how much will the centripetal force applied by the tracks change by?

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Answer 1 · 2017-02-16T10:53:29

The centripetal force will change by #19.03N#

The centripetal force is

#F=mr omega^2#

The variation in centripetal force is

#DeltaF=mr(Delta omega)^2#

#=7*6*((1/2-2/7)2pi)^2#

#=42*9/14^2*pi^2#

#=19.03N#