[填空题]
While fishing, you gi)j 51zqqdez -lca.,qjhsvr9 q96( c qqwdhi/q ,xi;) et bored and start to swing a sinker weight around in a circle below you on a 0.25-m piece of fishing line. The weight makes a complete circle every 0.50 s. What is the angle that the fishing line makes with thhqs9 jri/(xlwq.cqq;a6c ,qv di) h9,e vertical? [Hint: See Fig. 5–10.] $^{\circ}$
