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 $=mw_2^2r-mw_1^2r$
$=4pi^2mr(n_2^2-n_1^2)=4xxpi^2xx4xx5xx(1/4^2-1/9^2)$
$~~39.6N$

A model train, with a mass of 4 kg4 kg, is moving on a circular track with a radius of 5 m5 m. If the train's rate of revolution changes from 1/9 Hz1/9 Hz to 1/4 Hz1/4 Hz, by how much will the centripetal force applied by the tracks change by?