學士後西醫物理及化學題庫下載題庫

39. A wheel of radius ? and moment of inertia I is mounted on a frictionless horizontal axle as shown in the figure. A light cord wrapped around the wheel supports an object of mass m. What is the linear acceleration of the object? (Gravitational acceleration is g)

(A)  
(B)
(C) 2
(D)
(E)