1. A small coin is placed at the rim of a turntable of radius R which rotates at angular velocityω. What is the minimum coefficient of friction (μ min) for the coin to stay on?
(A) Rω/2g ;
(B) Rω2/ 2g ;
(C)Rω2/g ;
(D) R2ω/ g ;
(E) None.

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統計: A(0), B(0), C(2), D(0), E(0) #3188032

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