[填空题]
Arlene is to walk across a "high wire" strung horezjf - uppt,1+izontally betwe+f vhk,.9fxmvedie/* en two buildings 10.0 m apart. The sag in the rope when9evik+he vf/ m*x, f.d she is at the midpoint is 10.0$^{\circ}$ as shown in Fig. 4-42 . If her mass is 50.0 kg , what is the tension in the rope at this point?