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  • The string has a mass . How much time will it take for a transverse disturbance produced

The string has a mass 4.5 \mathrm{~g}. How much time will it take for a transverse disturbance produced at the floor to reach the pulley?

Option: 1

0.04 \mathrm{~s}


Option: 2

0.2 \mathrm{~s}


Option: 3

0.3 \mathrm{~s}


Option: 4

0.02 \mathrm{~s}


Answers (1)

best_answer

$$ \begin{aligned} & v \sqrt{\frac{T}{\mu}}=\sqrt{\frac{20}{2 \times 10^{-3}}}=100 \mathrm{~m} / \mathrm{s} . \\ & \mu=\frac{4.5}{2.25}=2 \mathrm{~g} / \mathrm{m} \quad s=4 t-\frac{1}{2} g t^{2} \\ & 2=100 t-5 t^{2} \\ & t^{2}=-20 t+0.4=0 \end{aligned}

\quad t=\frac{+20 \pm \sqrt{400-1.6}}{2} \\

\quad=0.02 \text { second }

Posted by

Irshad Anwar

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