1.

A coin is placed at the edge of a horizontal disc rotating about a vertical axis through its axis with a uniform angular speed 2 rad \[{{s}^{-1}}\]. The radius of the disc is 50 cm. Find the minimum coefficient of friction between disc and coin so that the coin does not slip \[(g=10m{{s}^{-2}})\].

A. 0.1                  
B. 0.2     
C. 0.3                  
D. 0.4
Answer» C. 0.3                  


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