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Question-135405




Question Number 135405 by muhammadabdallah last updated on 12/Mar/21
Commented by mr W last updated on 13/Mar/21
you should tell what you are talking  about.  i guess you are talking about the  period of a torsion pendulum. then  I is not the moment of inertia of the  wire, which makes no sense here,  but the moment of inertia of the  suspended body.
$${you}\:{should}\:{tell}\:{what}\:{you}\:{are}\:{talking} \\ $$$${about}. \\ $$$${i}\:{guess}\:{you}\:{are}\:{talking}\:{about}\:{the} \\ $$$${period}\:{of}\:{a}\:{torsion}\:{pendulum}.\:{then} \\ $$$${I}\:{is}\:{not}\:{the}\:{moment}\:{of}\:{inertia}\:{of}\:{the} \\ $$$${wire},\:{which}\:{makes}\:{no}\:{sense}\:{here}, \\ $$$${but}\:{the}\:{moment}\:{of}\:{inertia}\:{of}\:{the} \\ $$$${suspended}\:{body}. \\ $$
Commented by mr W last updated on 13/Mar/21
please check again! for torsion  pendulum, i think it is  T=2π(√((2IL)/(ηπa^4 )))
$${please}\:{check}\:{again}!\:{for}\:{torsion} \\ $$$${pendulum},\:{i}\:{think}\:{it}\:{is} \\ $$$${T}=\mathrm{2}\pi\sqrt{\frac{\mathrm{2}{IL}}{\eta\pi{a}^{\mathrm{4}} }} \\ $$

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