A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #5 m#. If the train's rate of revolution changes from #1/9 Hz# to #1/4 Hz#, by how much will the centripetal force applied by the tracks change by?

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Answer 1 · 2016-04-22T11:16:37

Change in centripetal force#=mw_2^2r-mw_1^2r#
#=4pi^2mr(n_2^2-n_1^2)=4xxpi^2xx4xx5xx(1/4^2-1/9^2)#
#~~39.6N#