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Require physics help
USSEnterprise:
Now I am trying to find the approximate drag of the boat using the following formula:
Fd = 1/2pb2ACd
Fd = force of drag
p = pressure of fluid
v = velocity relative to fluid
A = reference area
Cd =Drag coefficient
What is the reference area?
rockhopper:
The reference area is the frontal area presented. Ie for a sphere the frontal area would be a circle.
You should note, that the drag on a partially submerged hull will also depend on the bow wave produced. It takes energy to produce the bow wave, and this energy is effectively added to it's drag.
If you look up and decent fluids text on Froude numbers and their relation to drag it will help. Note that any calcs you do will be a very rough estimate and won't give you anything useful. I'd just concentrate on the theory behind the drag, rather than the specific numbers.
Hope that helps
Zero_Hour:
--- Quote from: missioncontrol on May 13, 2007, 05:42:37 am ---so if canoe A is leaving the docks at 8:45 and paddling 45 strokes per minute and canoe B which is 4 miles downstream leaves the docks at 10:17 and paddling at 28 strokes per minute, what time do they eat lunch?
--- End quote ---
Time is an illusion. Lunchtime doubly so.
Ed_McCarron:
--- Quote from: Zero_Hour on May 13, 2007, 09:08:54 pm ---
--- Quote from: missioncontrol on May 13, 2007, 05:42:37 am ---so if canoe A is leaving the docks at 8:45 and paddling 45 strokes per minute and canoe B which is 4 miles downstream leaves the docks at 10:17 and paddling at 28 strokes per minute, what time do they eat lunch?
--- End quote ---
Time is an illusion. Lunchtime doubly so.
--- End quote ---
Since we're on that topic...
danny_galaga:
--- Quote from: USSEnterprise on May 13, 2007, 01:46:11 pm ---Now I am trying to find the approximate drag of the boat using the following formula:
Fd = 1/2pb2ACd
Fd = force of drag
p = pressure of fluid
v = velocity relative to fluid
A = reference area
Cd =Drag coefficient
What is the reference area?
--- End quote ---
you are going to have some difficulty seeing as how velocity isnt actually in the above formula ;)
yes, i can see that the B is supposed to be velocity
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