DC 10 Jet liner is flying straight and level at 21,000 feet at a constant speed of 600 miles/hour. The engines are delivering a combined thrust of 100,000 lbs. What must the drag force of air be? a. _____________ The aircraft with its passangers and cargo weighs 500,000 lbs. What is the total lift force acting upward on the plane to keep it in the air? b. ________________

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DC 10 Jet liner is flying straight and level at 21,000 feet at a constant speed of 600 miles/hour. The engines are delivering a combined thrust of 100,000 lbs. What must the drag force of air be? a. _____________ The aircraft with its passangers and cargo weighs 500,000 lbs. What is the total lift force acting upward on the plane to keep it in the air? b. ________________

Physics
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ghere , let the drag force by air is Fd as the plane is moving with constant velocity net force on the plane will be zero Fd - 100000 = 0 Fd = 100,000 lbf the drag force is 100,000 lbf b) as the plane is at constant height Flift - W = 0 Flift - 500,000 = 0 Flift = 500,000 lbf the total lift force acting upward on the plane to keep it in the air is 500,000 lbf

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