The permissible value of angular speed, so that the wheels do not get lifted from the rails is given by -

1
ω = \(\sqrt\frac{{Pg}}{{Bb}}\)
2
ω = \(\sqrt \frac{{2Pg}}{{Bb}}\)
3
ω = \(\sqrt \frac{{Pg}}{{2Bb}}\)
4
ω = \(\sqrt \frac{{2Pg}}{{Bg}}\)

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