• Part A The equation P U.(dm/dt) for the thrust on a rocket, can also be applied to an airplane propeller. In fact, there are two contributions to the thrust one posisve and one negative. T positive contribution comes from air pushed backward, away from the propeller (so drm/dt <0) at a speed tler relative to the propeller. The negative contribution comes from this same quantity of air fowing into the front of the propeller (so dm/dt > 0) at speed v. equal to the speed of the airplane through the air. For a Cessna 182 (a single-engine airplane) fying at 130 km/h, 150 kg of air flows through the propeller each second and the propeller develops a net thrust of 1300 N. Determine the speed increase (in km/h) that the propeller imparts to the air km/h

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!