Can someone answer these questions by any chance? I'll owe you! 1. Calculate the residence time of water in the oceans. 2. How many times could a water molecule have been recycled since the formation of the oceans? Calculate the speed of the tide in the open ocean. Calculate the resonant period of the tide in Long Island Sound They're extra credit questions that I desperately need for a class I'm doing pretty shitty in.
Well, you're up late. Don't you have to show up to work at McDonalds pretty early tomorrow morning then?
http://www.google.com/search?hl=en&...cts=1273822614716&aq=f&aqi=&aql=&oq=&gs_rfai= http://www.google.com/search?hl=en&...cts=1273822665653&aq=f&aqi=&aql=&oq=&gs_rfai= http://www.google.com/search?hl=en&...cts=1273822684837&aq=f&aqi=&aql=&oq=&gs_rfai= http://www.google.com/search?hl=en&...cts=1273822709569&aq=f&aqi=&aql=&oq=&gs_rfai=
Speed of tide in open ocean is 200 m/s, assuming an ocean depth of 4000m. Equation for that is sqrt(g*h), where g is gravitational acceleration const. and h is mean depth of water in meters. ( Segar, D.A. (2007). Introduction to Ocean Science. New York: W.W. Norton. pp. 581+.) Trying to find out about the others now. Not so learned in ocean science and metoc stuff.
www.geo.hunter.cuny.edu/~fbuon/GEOL_180/Lectures/chapt11.ppt Period of tide is T = (4*l)/sqrt (g*d) where l is length of LI Sound (110 mi), g is gravitational const., d is average depth (78 feet). since period is going to be in seconds, you don't have to translate everything to meters or whatever. just us 4*110mi*5280ft/mi to get 2323200 feet for the numerator. For the demoninator, 9.8meters/s^2*3.3feet/1m*78feet. Looks like 12.8 hours.
http://en.wikipedia.org/wiki/Water_cycle, hysicalGeography.net. CHAPTER 8: Introduction to the Hydrosphere. residence time of water in oceans is 3200 years on that chart...doesn't have a calc for it that I can see. That means that, since God formed the oceans on the third day, about 7000 years ago, the water molecule has recycled b/w 2 and 3 times. If your prof doesn't believe that, use the more generally-accepted 4.7B years or so divided by 3200 years.
Brian, you're awesome. Don't let anyone tell you different. Btw, just so I'm 100% sure. The answer to the water molecule question would be 4.7 billion/40,000. Right?
that's how i read it, yeah. I don't have a warm fuzzy for why two sources come up with different numbers for the residence time, and both without showing the calculations. I guess there are a bunch of assumptions that go into it...so whether the number is 3200 or 40000 I wouldn't bet the farm on (you might be able to set it up in a problem where you state your assumptions, and just roll with the 40000 number) but the end calculation will be the 4.7B/40000 to get "number of times recycled".
