A pipe carrying an ideal fluid narrows from a radius of 3 cm to 1 cm. What is the ratio of the final speed to the initial speed?
Q1. A pipe carrying an ideal fluid narrows from a radius of 3 cm to 1 cm. What is the ratio of the final speed to the initial speed?
Answer: 9:1
Explanation: The ratio of radii is 1:3, so the ratio of areas is 1:9. By continuity, the speed ratio is the inverse of the area ratio, 9:1.