A Venturi Tube May Be Used as the Inlet to an Automobile

Multiple Choice

A venturi tube may be used as the inlet to an automobile carburettor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? ( $\rho$ = 1.2 kg/m3.)

A) 70 Pa
B) 85 Pa
C) 100 Pa
D) 120 Pa
E) 81 Pa