A) 5
B) 10
C) 0.1
D) 0.7
Correct Answer: D
Solution :
Key Idea: The centripetal force to the body on circular path is supplied by the frictional force. For body to move on circular path, Frictional force provides the necessary centripetal force, i.e., frictional force = centripetal force or \[\mu \,mg=\frac{m{{v}^{2}}}{r}=mr{{\omega }^{2}}\] or \[\mu g=r{{\omega }^{2}}\] \[\therefore \] \[0.5\times 9.8=10{{\omega }^{2}}\] or \[\omega =0.7\,rad/s\]
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