A Hypodermic Needle Consists of a Plunger of Circular Cross-Section

question 4

Multiple Choice

A hypodermic needle consists of a plunger of circular cross-section that slides inside a hollow cylindrical syringe. When the plunger is pushed, the contents of the syringe are forced through a hollow needle (also of circular cross-section) . If a 4.0-N force is applied to the plunger and the diameters of the plunger and the needle are 1.2 cm and 2.5 mm, respectively, what force is needed to prevent fluid flow at the needle?

• A)0.17 N
• B)0.27 N
• C)0.43 N
• D)0.83 N
• E)2.7 N

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Definitions:

Rococo Style

An 18th-century artistic movement and style, affecting many aspects of the arts including painting, architecture, and decoration, noted for its elaborate ornamentation, asymmetrical values, and lightness.

Porcelain

A hard, fine-grained ceramic material made by heating refined materials, often including kaolin, in a kiln to high temperatures, known for its translucency, strength, and white color.

Salons

Social gatherings, often hosted in private homes during the 17th and 18th centuries in Europe, where intellectuals, philosophers, artists, and politicians came together to discuss ideas and enjoy artistic performances.

Hosted

Acted as an organizer or provider of space and resources for an event, meeting, or gathering, ensuring guests are accommodated and the event runs smoothly.