A 6.5-cm-diameter ball has a terminal speed of 26 m/s. Find the ball’s mass and use ρ = 1.2 kg/m3 for the density of air at room temperature.

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swordsworn4xi · Accepted Answer

D  =            C      ρ              ν        2            A        2      m  g  =            C      ρ              ν        2            (      π                        d          2                4            )        2      m  g  =            C      ρ              ν        2            (      π              d        )                    8      g          m  g  =            (      0.207      )      (      1.2      k      g              /                    m        3            )      (      26      m              /            s              )        2            (      π      )      (      6.5      c      m              )        2            (                                    10                          −              2                                m                          1          c          m                            )        2                    8      (      9.8      m              /                    s        2            )          =  0.028  k  g    ≈  28  g

A 6.5-cm-diameter ball has a terminal speed of 26 m/s. Find the ball’s mass and use ρ = 1.2 kg/m3 for the density of air at room temperature.

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