JEE Main 2020PhysicsMechanical Properties of SolidsMediumNumerical

JEE Main 2020 — Mechanical Properties of Solids Question with Solution

JEE Main 2020 (09 Jan Shift 1)

Question

A body of mass m=10 kg is attached to one end of a wire of length 0.3 m. What is the maximum angular speed (in rad s-1) with which it can be rotated about its other end in a space station without breaking the wire?
[Breaking stress of wire σ=4.8×107 N m-2 and area of cross-section of the wire=10-2 cm2]

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Show full solutionCorrect answer: 4
Correct answer
4

Step-by-step explanation


TA=σ………………….1
T=mω2l………………….2
Solving we get,
ω=4 rad s-1

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About this question

This is a previous-year question from JEE Main 2020, covering the Mechanical Properties of Solids 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.