[填空题]
Four 9.5-kg spheres are ll-cor ip+kz2. ocated g3jc.iw8nd )kat the corners of a square of side 0.60 m. Calculate the magnitude and direction of the total gravitation.jg38nd) wkc ial force exerted on one sphere by the other three. $\times 10^{-1} \mathrm{~N} \text { at }$ $^{\circ}$
