Question

A string of length 1 m is fixed at one end caries a mass 'm' at the other end. the string makes $\frac{2}{\pi }$ rev/s around the horizontal axis through the fix end as shown in the fig. the tension in the string i

• A. 16 ml
• B. 4 ml
• C. 8 ml
• D. 2 ml

Answer 1

The correct option is A 16 ml

$\begin{array}{c}T\sin \theta =mr{w}^2\\ T\left(\frac{r}{l}\right)=mr{\left[2\pi .\frac{2}{\pi }\right]}^2\\ \therefore T=16ml\end{array}$

Hence, Option $A$ is correct .