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What far-reaching change came from the Crusades? If the external force acting on a system is zero, the momentum of the system is zero as well. True or False? Physics resistance question? Is there a succinct mathematical symbol that describes, "but" or "though", just how there are symbols for less than or greater than? At a store, 2 gallons of milk cost $6. Which is the value of the ratio of dollars to gallons of milk?