Flow rate: When fluid flows at a moderate velocity through a tube, the radius R of the tube is related tothe flow rate F (measured as volume per unit time) by the formula a. Atechnician adjusts the...

Flow rate: When fluid flows at a moderate velocity through a tube, the radius R of the tube is related tothe flow rate F (measured as volume per unit time) by the formula

a. Atechnician adjusts the radius of a tube and finds that the flow rate has doubled. By what factor has the radius changed?

b. If the radius is tripled, what happens to the flow rate?