試題詳解

24. A venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter horizontal pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 2.0 m/s in the 2.0-cm section? (p= 1.2 kg/m3.)
(A)70Pa
(B)85Pa
(C)95Pa
(D)20 Pa
(E) 36 Pa