Question 13 (1 point) An airplane is flying in level flight with constant velocity. The forward "thrust" force acting on the airplane is greater than the "drag" force acting in the opposite direction. True False Previous Page Next Page Page 13 of 19
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Lift Thrust Drag Weight The pictured airplane is in steady-level flight. This means that its lift is exactly equal to its weight and the thrust produced by the propeller is just enough to overcome the drag, allowing it to fly with constant velocity. True/False: The airplane is accelerating. True False
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An airplane of mass $1.50 \times 10^{4} \mathrm{kg}$ is in level flight, initially moving at 60.0 $\mathrm{m} / \mathrm{s}$ . The resistive force exerted by air on the airplane has a magnitude of $4.0 \times 10^{4} \mathrm{N} .$ By Newton's third law, if the engines exert a force on the exhaust gases to expel them out of the back of the engine, the exhaust gases exert a force on the engines in the direction of the airplane's travel. This force is called thrust, and the value of the thrust in this situation is $7.50 \times 10^{4} \mathrm{N}$ . (a) Is the work done by the exhaust gases on the airplane during some time interval equal to the change in the airplane's kinetic energy? Explain. (b) Find the speed of the airplane after it has traveled $5.0 \times 10^{2} \mathrm{m} .$
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