A semicircular disc of radius \( R \) and mass \( M \) is pulled by a horizontal force \( F \) s...

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A semicircular disc of radius \( R \) and mass \( M \) is pulled by a horizontal force \( F \) so that it moves with uniform velocity. The coefficient of friction between disc and ground is \( \mu=\frac{4}{3 \pi} \). Find the value of \( \theta \) in degree.
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