You have been asked to hang a metal sign from a single vertical wire. The sign has the triangular shape shown in Figure 9.20a. The bottom of the sign is to be parallel to the ground. At what distance from the left end of the sign should you attach the support wire? A projectile fired into the air suddenly explodes into several fragments (Active Fig. 9.21). (A) What can be said about the motion of the center of mass of the system made up of all the fragments after the explosion?
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