A model train, with a mass of #2 kg#, is moving on a circular track with a radius of #4 m#. If the train's rate of revolution changes from #3 Hz# to #1 Hz#, by how much will the centripetal force applied by the tracks change by?

1 Answer
Jul 8, 2017

Answer:

The centripetal force changes by #=1263.3N#

Explanation:

The centripetal force is

#F=mr omega^2#

The mass is #m=2kg#

The radius #r=4m#

The change in angular velocity is

#Delta omega=(3-1)*2pi=(4pi)rads^-1#

The variation in centripetal force is

#DeltaF=mr(Delta omega)^2#

#=2*4*(4pi)^2#

#=1263.3N#