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Problems CH 05

Problems CH 05. 131. Drag Force and Terminal Speed

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Problems CH 05

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  1. Problems CH 05 131

  2. Drag Force and Terminal Speed When an object moves through a fluid (gas or liquid) it experiences an opposing force known as “drag.” Under certain conditions (the moving object must be blunt and must move fast so the flow of the liquid is turbulent) the magnitude of the drag force is given by the expression Here C is a constant, A is the effective cross-sectional area of the moving object, ρ is the density of the surrounding fluid, and v is the object’s speed. Consider an object (a cat of mass m in this case) that starts moving in air. Initially D = 0. As the cat accelerates D increases and at a certain speed vtD = mg. At this point the net force and thus the acceleration become zero and the cat moves with constant speed vtknown as the terminal speed. (6-4)

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