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AP Physics 1
8.4 Fluids and Conservation Laws
8.2 Pressure
IntermediateMCQMathematicalConceptual15.9k
Horizontal syringe ejecting fluid from a wide barrel through a narrow needle into the atmosphere.
Horizontal syringe ejecting fluid from a wide barrel through a narrow needle into the atmosphere.
A horizontal hypodermic syringe consists of a wide cylindrical barrel of cross-sectional area \(A_{\text{barrel}}\) connected to a narrow needle of cross-sectional area \(A_{\text{needle}}\), where \(A_{\text{barrel}} > A_{\text{needle}}\). An ideal, incompressible fluid completely fills the syringe. A plunger is pushed to move fluid through the barrel at a constant speed \(v_{\text{barrel}}\), ejecting it horizontally through the open needle into the atmosphere at pressure \(P_{\text{atm}}\). Which of the following correctly compares the fluid speed in the needle \(v_{\text{needle}}\) to \(v_{\text{barrel}}\), and the absolute fluid pressure in the barrel \(P_{\text{barrel}}\) to \(P_{\text{atm}}\)?

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