[填空题]
A coin is placed 11.0 cm from the axis of a rotating turntable tsv5xlh+hg; wdrwmv0,x*u3 / of variable m2s8okcyavkrmo n 8d2oh7g2 *bs (o*;speed. When the speed of the turntable o(kv*o mhk;o2b8o 278ca r2 ng syd*msis slowly increased, the coin remains fixed on the turntable until a rate of 36 rpm is reached and the coin slides off. What is the coefficient of static friction between the coin and the turntable?
