Brain Teasers
Lost Cargo
Mad Ade is on a barge in a lock on a canal. The lock is 25 feet long, 12 feet wide and 20 feet deep. It holds enough water to reach the 10 foot level normally. With the barge, the water is at the 13 foot level. Your cargo is concrete blocks that are 6 inches cubed, and Mad Ade has just accidentally dropped 800 of them overboard. By how much would the water level rise?
Answer
It wouldn't rise at all. The weight of the blocks when aboard the barge had already made the level rise, dropping them overboard would make the barge lighter, but the water level would remain constant, because the weight has only transferred from the barge to the actual water.Hide Answer Show Answer
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