[填空题]
Arlene is to walk across a "high wire" strung horizontally betweeoifu 05 3gh,jr9i (sht wm* zyfza et/*m1x;q:yr ,5taz7 1vel 8ilmr+ iqy+lu no4,x5n two buildings 10.0 m apart. The sag in the rope when she i4y1q,n5layu7 5 l elvo+z+,imxtr r8 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?
