JEE Main 7 Jan 2020 Shift 1 Solved Paper

Section: Physics

Question : 7 of 75

Marks: +1, -0

As shown in the figure, a bob of mass m is tied by a massless string whose other end portion is wound on a fly wheel (disc) of radius r and mass m. When released from rest the bob starts falling vertically. When it has covered a distance of h, the angular speed of the wheel will be :

[7-Jan-2020 Shift 1]

1
r
√
2gh
3
r√
3
4gh
1
r
√
4gh
3
r√
3
2gh

Validate

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