(a) If the radius of a pipe narrows to half of its original size, will the flow speed in the narrow section (1) increase by a factor of 2, (2) increase by a factor of 4, (3) decrease by a factor of 2, or (4) decrease by a factor of 4? Why?
(b) If the radius widens to three times its original size, what is the ratio of the flow speed in the wider section to that in the narrow section?