24. 密度為d，體積為V的軟木以繩繫於一杯底，杯內注滿密度ρ(ρ﹥d)之液體，如右圖。若杯以a向下加速，則繩之張力大小為何？

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