[问答题]
A stone hangs by a fine thread from the ceiling, and a sectionbv2+nn vzvb-28 kuv1 g of the same ,vgh40 ds.js/ v6pezo thread dangles from the bottom of the stone (Fig. 4–36). If a 4 , ve.zsv6dhp0os/ jgperson gives a sharp pull on the dangling thread, where is the thread likely to break: below the stone or above it? What if the person gives a slow and steady pull? Explain your answers.
