[填空题]
Four 9.5-kg spheres are located at the corner+r d:jjvqy ;6ls olu q/7)ilwei(f a square of side 0.60 m. Calculate the magnitude and /u)ille7 (wiqdirection of the total gravitational force exerted on one sphere by the other three. $\times 10^{-1} \mathrm{~N} \text { at }$ $^{\circ}$
