A Hypodermic Needle Can Be Thought of as a Large

question 33

Multiple Choice

A hypodermic needle can be thought of as a large area pipe leading to a small area pipe that opens into the vein.The diameter of the plunger is 1.2 cm and the needle diameter is 0.15 cm.If the gauge pressure in the vein is 25 mmHg,what minimum force is needed on the plunger in order for a fluid flow into the vein to occur?

• A)0.38 N
• B)0.19 N
• C)0.0060 N
• D)31 N
• E)0.12 N