二、如果某國遭受嚴重流感的風暴，民眾為避免感染較少外出，因而造成自主性的消費減少。試利用IS-LM模型分析此流感的風暴是否會帶來該國經濟的衰退。另外，此時該國的名目利率如果很低約1％水準，請問該國政府可否採用寬鬆的貨幣政策來恢復經濟景氣嗎？(35分)

2. The pressure drop, \( \Delta p \), for incompressible turbulent flow in a horizontal round pipe of diameter \( D \) can be written in functional form as \[ \Delta p = F(V, D, l, \varepsilon, \mu, \rho) \] where \( V \) is the average velocity, \( l \) is the pipe length, \( \varepsilon \) is a measure of the roughness of the pipe wall, \( \rho \) and \( \mu \) are fluid density and viscosity, respectively. Find a non-dimensional relationship for \( \Delta p \). (use \( \rho \), \( V \), \( D \) as repeating variables) (20分)

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