NAUI Master Diver Test

[BoltSnap]

In relation to this question let me ask: In the Master diver test do you get questions like

An inverted 1-gallon bottle immersed in a cauldron of 68o F water is half full of air. If the water is heated to 180o F, what will be the volume of air in the bottle?
Answer:
The temperature has to be absolute temperature so we have to convert from Fahrenheit to Rankine. .5 gallon / (68o F + 460o) = V2 / (180o F + 460o) .5 / 528 = V2 / 640 .000946 = V2 / 640 V2 = .000946 x 640 V2 = .60544 gallons

OR

A cylinder contains 95 cubic feet of air at a temperature of 84o F. What volume of gas is available to the diver at a depth of 112 feet in a cold water lake in which the temperature is 40o F?
Answer:
112 ft /34 = 3.294 ata + 1 ata = 4.294 ata 84o F + 460o = 544o 95 ft3 x 1 ata = 95 95 / 544o = .174 .174 = (4.294 x V2) / (40o F + 460o) .174 = 4.294 V2 / 500 500 x .174 = 4.294 x V2 87 = 4.294 x V2 V2 = 87/4.294 V2 = 20.260 V2 = 20.260 ft3


If you do how are you supposed to remember all these formulas when my instructor says Closed book and closed NOTES.
Are there any tips on how you guys remembered the formulas or were you allowed to bring in conversion charts ect.ect.

You will get this type of questions and you will even get the ones that are tricky. You need to understand the concept or "physics" of the formulas for you to be able to derive the formulas instead of memorizing them.

 

[LakeCountyDiver]

You will get this type of questions and you will even get the ones that are tricky. You need to understand the concept or "physics" of the formulas for you to be able to derive the formulas instead of memorizing them.

Ok well that still does not help at all. How does one just understand the concept or are you just born with it? What is the meterial you read and watched to understand all those formulas.

 

[BoltSnap]

The two first sources are the NAUI MD Textbook and the instructor for the course. You'll also need to look up the various material out there related to diving physics that would help (I am assuming that you are only inquiring about physics but same applies to other parts).

Is this what you are asking about or am I missing your point?

 

[LakeCountyDiver]

The two first sources are the NAUI MD Textbook and the instructor for the course. You'll also need to look up the various material out there related to diving physics that would help (I am assuming that you are only inquiring about physics but same applies to other parts).

Is this what you are asking about or am I missing your point?

Ya thats pretty much it I have the text book but it is so confusing when it comes to the formulas and to boot it mixes SI and metric. I am just so lost when it comes to that. Everything else I have a pretty good grip on it is just the physics relating to the the sample problems I listed above is where I am lost. If you are supposed to remember all the units in your head and how to do the problem in your head that dont really leave me much room for anything else.
Did you take your test with just your brain for did you get to reference any material?

 

[BoltSnap]

I was certified NAUI MD about 25 years ago. There was no textbook. I had to study from various not so helpful references that were available at that time. Same thing for Instructor training. I am an Electrical Engineer by education and work so I had a head start on this matter.

Are you working with an instructor right now?

 

[LakeCountyDiver]

Yes I am but he is being really tough about it and I just want to be sharp come test time. I dont just want to learn enough to pass the test I want to really know this stuff and I know I can do it If I could reference the book and other various materials at the time of need but it is for this test he says you are not allowed anything no notes or book ect.ect so I am just want to learn a good way to remember the basics so come test time I wont be so lost but it is a lot to remember.

 

[BoltSnap]

The only way to get better in physics is practice with problem solving. Do you have access to physics problems for you to practice with at all?

 

[Thalassamania]

I was certified NAUI MD about 25 years ago. There was no textbook. I had to study from various not so helpful references that were available at that time. Same thing for Instructor training. I am an Electrical Engineer by education and work so I had a head start on this matter.

Yeah, but then you had Papa H, Ken Skitt and me to help you through, not to mention your engineering background.

My suggestion is to be sure that you understand each separate gas law and PV=nRT as two different approaches. The latter one helps those who want a "plugin solution" and the former is for those who work better in "common sense" and ratios.

 

[BoltSnap]

"Ken Skitt" with Physics??? I didn't really have much interaction with Ken except for social events after the ITC.

I was certified as a MSD before I showed up for the ITC. I had to go through the agony of reading Fred Calhoun's physics book waaaaaay back then.

I can't believe that this happened 25 years ago. I was a Junior at WPI.

 

[Thalassamania]

Who did your MSD? I thought you did it with us as part of the MSD, Prep Course, ITC sequence ... but that was a loooooong time ago, and since you helped staff the later ones, it is rather easy to "disremember."