Scared Silly
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Figure in all the software (ropes) hardware (biners) and yer gonna need more lift than just what the anchor weights. And if it is stuck in the sand.
Quiz - Physics - Minimum Amount of Water That Must Be Displaced
- Thread starter Pedro Burrito
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the real question is: How many SpareAir units are needed to accomplish this lift? 
2 of the larger one.the real question is: How many SpareAir units are needed to accomplish this lift?
The question was NOT how much lift do you need. It was what is the minimum....and that is the object. Then you'll of course need to lift the tackle, and maybe break it free from the mud, etc. But that was not the question. It is a physics question...not a Search and Recovery question.
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I could do the math simply by looking it up in the Encyclopedia, Diving Knowledge Workbook, or elsewhere, as I recall it's not hard to do. I have no interest in ever lifting anything heavy enough to need a lift bag from the bottom. If someone were to pay me to do so, I'd look it up.....
I suppose someone will point out that having this on the tip of the tongue is vital in some way for being a divemaster... Such as "suppose a student asks about this"?
Is this the type of question that was eliminated from the old DM course in 2010, but still must be addressed in the IDC?
I suppose someone will point out that having this on the tip of the tongue is vital in some way for being a divemaster... Such as "suppose a student asks about this"?
Is this the type of question that was eliminated from the old DM course in 2010, but still must be addressed in the IDC?
This is not a practical question--it's a theory question. How often do you think you will be called upon to lift something off the floor and know what its weight and displacement are?
When you actually lift something, it's a guessing game. You guess what size bag(s) you will need, and you make sure you bring enough. Then you add air a little at a time until you can move it.
When you actually lift something, it's a guessing game. You guess what size bag(s) you will need, and you make sure you bring enough. Then you add air a little at a time until you can move it.
OP
a. 54.9 litres / 2 cubic feet
I might be from the USA but I do and teach all my scuba in metric.
For metric:
175/1.03 - 115 = 54.9 litres
I might be from the USA but I do and teach all my scuba in metric.
For metric:
175/1.03 - 115 = 54.9 litres
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