【简答题】(清华大学2006--2007学年春季学期期中考试试题)A football,meant to be thrown at 60 mi/h in sea--level air(ρ=1.22 kg/m3,μ=1.78E-5 N s/m2)is to be tested using a one—quarter(1/4)scale model in a water tunnel(ρ=998 kg/m3,μ...
【简答题】(清华大学2006--2007学年春季学期期中考试试题)as in Fig.4-62,A liquid jet of velocity Vj and area Aj strikes a single 180°bucket on a turbine wheel rotating at angular velocity Ω.Find an expression for the power P deli...