阿摩線上測驗
36. A frictionless curve of radius 500 m is banked with a banking angle θ = 30°. A ball of mass m = 10 kg and radius r = 50 cm is moving on it. What angular velocity is needed for the ball moving on the curve without need of frictional force?
(Gravitational acceleration g = 10 m/s2 ) (tan 30° = 0.577) 
(A) 53.7 rad/s
(B) 107.4 rad/s
(C) 214.8 rad/s
(D) 332.2 rad/s
(E) 429.6 rad/s
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統計： A(2), B(7), C(1), D(0), E(0) #3233302
統計： A(2), B(7), C(1), D(0), E(0) #3233302
