177_Physics ProblemsTechnical Physics

177_Physics ProblemsTechnical Physics - Chapter 6 (a) slope...

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Chapter 6 179 *P6.53 (a) slope = = 0160 0 99 00162 . . . N ms kg m 22 (b) slope == = R v DA v v 2 1 2 2 2 1 2 ρ (c) 1 2 = . k g m D 200162 120 0105 0778 2 . .. . kg m kg m m 3 bg ej af π (d) From the table, the eighth point is at force mg = 8 1 64 10 9 8 0 129 3 . kg m s N 2 e j and horizontal coordinate 280 2 m s . The vertical coordinate of the line is here 28 0127 2 . kg m m s N b g = . The scatter percentage is 0129 15% . N N 0.127 N = . (e) The interpretation of the graph can be stated thus: For stacked coffee filters falling at terminal speed, a graph of air resistance force as a function of squared speed demonstrates that the force is proportional to the speed squared within the experimental uncertainty estimated as 2%. This proportionality agrees with that described by the theoretical equation RD A v = 1 2 2 . The value of the constant slope of the graph implies that the drag coefficient
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