45. 一半徑為R的球沿一與水平夾角的斜面滾下，且有發生滑動現象。則球對球心的角加速度為何？(設動摩擦係數為(D)k，静摩擦係數為(D)s)

6. Given that the enthalpy required to convert CHCl3(g) to gaseous C, H, and Cl atoms is 1397 kJ/mol and that the dissociation enthalpy of a C-H bond is 413 kJ/mol, what is the bond dissociation enthalpy of a C-Cl bond？ (A)328 kJ/mol　(B)603 kJ/mol　(C)984 kJ/mol　(D)1397 kJ/mol