[填空题]
Calculate the moment of ihfx.k*4mhl0 jvr0+ br,xva,rner,x7 rb1r/34 x fn nd8v9zdleurtia of the array of point objects shown in Fig. 8–43 ab8r7dzn,9rexf4 xr /d1 lb3 unvout (a) the vertical axis, $kg \cdot m^2$ (b) the horizontal axis. Assume m=1.8 kg,M=3.1kg and the objects are wired together by very light, rigid pieces of wire. The array is rectangular and is split through the middle by the horizontal axis. $kg \cdot m^2$ (c) About which axis would it be harder to accelerate this array?