The equation f=−vex(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 positive and one negative. the positive contribution comes from air pushed backward, away from the propeller (so dm/dt< 0), at a speed vex relative to the propeller. the negative contribution comes from this same quantity of air flowing into the front of the propeller (so dm/dt> 0) at speed v, equal to the speed of the airplane through the air.
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If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?
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The heliocentric and the geocentric models of the solar system included these central principles
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The equation f=−vex(dm/dt) for the thrust on a rocket, can also be applied to an airplane propeller....
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