$A$ disc has mass $m$ and radius $R$. How much tangential force should be applied to the rim of the disc so as to rotate it with angular velocity $\omega$ in time $t$?
- A$\frac{mR \omega}{2 t}$
- B$mR \omega t$
- C$\frac{mR \omega}{4 t}$
- D$\frac{mR \omega}{t}$
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