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  1. I'd appreciate any answers to this logic conundrum. Thanks. Engineers are confronted with two apparently true but contradictory statements: a) To fly, lift must equal the weight of the airplane (Lift = Weight). b) Commercial airliners such as Boeing 747-400 and Airbus 320 have thrust-to-weight ratios of about 0.3. i.e. Thrust / Weight = 0.3 If the engine thrust (Thrust) is 3N, then the weight must be 10 N, and the Lift must be 10 N as well. But there is a significant problem: According to this logic, 10 N of Lift is 7 N greater than the 3 N of Thrust. T
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