5. A pendulum consists of a massless rod and a uniform circular disk (mass 2 kg, radius 20 cm). Distance from pivot to center of disk is 60 cm. Released at 30° from vertical. What is the speed of the center of mass when the rod is vertical? (I = 1/2 MR²)
(A) 1.18 m/s
(B) 1.22 m/s
(C) 1.26 m/s
(D) 1.30 m/s
(E) 1.34 m/s
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統計: 尚無統計資料
統計: 尚無統計資料