5.48. Set Up:Use coordinates where is upward and is horizontal to the right. The applied force pushes tothe left so the friction force is to the right.Solve: (a)The free-body diagram is given in Figure 5.48. The applied forcehas been replaced by itsxandycomponents.Figure 5.48(b)gives and(c)gives and (d)The maximum possible static friction force is (e)The vertical component of Fis now upward. now gives 5.49. Set Up:Solve: (a)must have units of N, so Dhas units (b)At the terminal velocity,and and5.50. Set Up:with Solve: (a)At the terminal velocity,and and(b)5.51. Set Up:Solve: (a)At the terminal speed (b)When (c)When Reflect:At the terminal velocity the upward drag force equals the downward gravity force and the acceleration iszero. At speeds less than the upward drag force is less than the weight and the person accelerates downward.5.52. Set Up:Similar objects have the same size and shape and therefore the same Din For an object ofweight W,andSolve: (a)so (b)so (c)so vt5"4VT52VT.Dvt254Wvt5"3VT.Dvt253
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