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How do we answer questions on Venn diagrams in set theory? How fast does the shrapnel fly in a bomb like the one in Manchester? I read 18,000ft per/sec., that can't be true or can it? A volume of H gas equal to 25L was collected at 25 deg C and 1 atm pressure. what's the volume of H if it is collected at 596K and 0.50 atm? How to answer questions on Venn diagrams in set theory? A bullet while going straight upwards gradually increases its -?