JEE Main 2020PhysicsMotion In Two DimensionsMediumMCQ

JEE Main 2020Motion In Two Dimensions Question with Solution

JEE Main 2020 (02 Sep Shift 1)

Question

A bead of mass m stays at point Pa, b on a wire bent in the shape of a parabola y=4Cx2 and rotating with angular speed ω (see figure). The value of ω is (neglect friction)

 

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Show full solutionCorrect option: A
Correct answer
A22gC

Step-by-step explanation

mω2acosθ=mgsinθ

ω=gtanθa

y=4cx2

tanθ=dydx=8xC

(tanθ)a,b=8aC

ω=g×8aca=22gC

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About this question

This is a previous-year question from JEE Main 2020, covering the Motion In Two Dimensions chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.