Packet 20: Bonus 18
This quantity was first introduced by George Stokes in 1851, but was named after the scientist who popularized it. For 10 points each:
[10m] What dimensionless quantity equals the ratio of inertial and viscous forces? This quantity is more than a few thousand in turbulent flow.
ANSWER: Reynolds number [or Re]
[10e] This type of flow, contrasted with turbulent flow, occurs at low Reynolds numbers. This type of fluid flow contains layers that move smoothly and experience little or no mixing.
ANSWER: laminar flow
[10h] Assuming laminar flow and this condition, the Hagen–Poiseuille (“HAH-gin pwah-ZOY”) equation gives the pressure drop of a fluid in a pipe. Water approximately obeys this condition in which the divergence of velocity equals zero.
ANSWER: incompressibility [or incompressible flow]
<Murray State A, Physics> | Packet F
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 2 | 91 | 17.36 | 92% | 47% | 34% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Guelph A | Toronto H | 0 | 10 | 0 | 10 | E |
| McMaster A | Toronto E | 10 | 10 | 0 | 20 | ME |
| McMaster B | Toronto I | 10 | 10 | 0 | 20 | ME |
| McMaster C | Toronto A | 0 | 10 | 0 | 10 | E |
| Toronto D | Waterloo B | 0 | 10 | 0 | 10 | E |
| Toronto F | Waterloo C | 0 | 10 | 0 | 10 | E |
| Toronto G | Queen's A | 0 | 0 | 0 | 0 | |
| Waterloo A | Toronto B | 10 | 10 | 10 | 30 | MEH |
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| Northern California | US | Y | 3 | 20.00 | 100% | 67% | 33% |
| Southern California | US | Y | 5 | 24.00 | 100% | 60% | 80% |
| Eastern Canada (1) | US | Y | 4 | 12.50 | 75% | 25% | 25% |
| Eastern Canada (2) | US | Y | 8 | 13.75 | 88% | 38% | 13% |
| Florida | US | Y | 2 | 15.00 | 100% | 50% | 0% |
| Great Lakes | US | Y | 9 | 22.22 | 100% | 78% | 44% |
| Lower Mid-Atlantic | US | Y | 8 | 18.75 | 100% | 50% | 38% |
| Upper Mid-Atlantic | US | Y | 6 | 16.67 | 83% | 67% | 17% |
| Midwest | US | Y | 9 | 20.00 | 89% | 67% | 44% |
| North | US | Y | 4 | 20.00 | 75% | 50% | 75% |
| Northeast | US | Y | 9 | 12.22 | 89% | 11% | 22% |
| Pacific | US | Y | 7 | 17.14 | 86% | 43% | 43% |
| South Central | US | Y | 4 | 10.00 | 100% | 0% | 0% |
| Southeast | US | Y | 10 | 17.00 | 100% | 50% | 20% |
| Upstate NY | US | Y | 3 | 20.00 | 100% | 33% | 67% |