A u-shaped tube is connected to a flexible tube that has a membrane-covered funnel on the opposite end as shown in the drawing. Justin finds that no matter which way he orients to membrane, the height of the liquid in the u-shaped tube does not change. Which of the following choices best describes this behavior?
A)Archimedes' principle
B)Bernoulli's principle
C)continuity equation
D)irrotational flow
E)Pascal's principle

Question

A u-shaped tube is connected to a flexible tube that has a membrane-covered funnel on the opposite end as shown in the drawing. Justin finds that no matter which way he orients to membrane, the height of the liquid in the u-shaped tube does not change. Which of the following choices best describes this behavior? 
A)Archimedes' principle 
B)Bernoulli's principle 
C)continuity equation 
D)irrotational flow 
E)Pascal's principle

Quizplus · Accepted Answer

This behavior is explained by Pascal's principle, which states that pressure applied to a fluid in a closed container is transmitted equally in all directions and at right angles to the enclosing walls. In this case, the pressure exerted by the liquid in the u-shaped tube is transmitted equally through the flexible tube and funnel membrane to the outside air, regardless of the orientation of the membrane. This causes the height of the liquid in the u-shaped tube to remain unchanged.

A U-Shaped Tube Is Connected to a Flexible Tube That