Directions
Read the following questions. Choose the right answer.
There is only ONE correct answer to each question.
[Figure: a wide tube narrowing toward a nozzle, with point 1 in the wide section, points 2 and 3 in the tapering middle section, and point 4 at the narrow outlet.] A liquid flows through the tube shown below. At which point does it have the greatest speed?
- 4
- 3
- 2
- 1
Show answer
Correct answer: A. 4
Why
By the continuity equation, flow speed is greatest where the cross-sectional area is smallest — that is the narrow outlet, point 4.