13.70.Set Up:The lift is where point 2 is at the lower wing surface and point 1 is at the upper wingsurface. Neglect in Bernoulli’s equation.Solve:13.71.Set Up:For a spherical astronomical object,Solve: (a)Find gon Europa:The gauge pressure at a depth of 100 m would be (b)Solve for hon earth that gives Reflect:gon Europa is less than on earth so the pressure at a water depth of 100 m is much less on Europa than itwould be on earth.13.72.Set Up:The discharge rate is The density of mercury is Let point 1 bewhere and point 2 is where Solve: (a)(b)(c)and13.73.Set Up:and Solve: (a)and where and are the heights of the liquid in the two cylinders.and so (b)so and Using gives(c)Once is measured,13.74.Set Up:Let and be the density of the fluid at points 1 and 2.Solve: (a)The derivation of Eq. (13.10) leads to and sodivides out and (b)If then the density divides out and the usual continuity equation is obtained.A1v15A2v2r15 r2r1A1v15 r2A2v2.Dtr1A1v1Dt5 r2A2v2Dt.
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