試題詳解

38. A 1 kg copper block and a 6 kg steel block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (θ = 60°) as shown in the figure. If the coefficients of friction of the copper-steel and steel-steel are 0.4 and 0.6, respectively, what is the acceleration of the two blocks? (Gravitational acceleration g = 10 m/s² )

(A) 5.28 m/s²
(B) 5.08 m/s²
(C) 4.88 m/s²
(D) 4.68 m/s²
(E) 4.28 m/s²