Recent content by bgizzle

Does it take the same amount of energy to lift water out of a tank as it would to force it out using compressed air? For example if there is a cylindrical tank that is 14 meters tall, 10 meters wide and it is filled with water to a depth of 5 meters I know that it takes 44.3e6 joules to lift...

Thanks for the response, this is exactly what I was looking for. I understand that it is very rough, that is what I am looking for. I am just working on a vague concept, nothing practical or anywhere near any sort of real world application. A couple of quick thoughts: the object would have no...

Thanks for your response, I checked out Euler buckle strength along with a bunch of other stuff on the subject. When you say load the sphere until the yield strength is reached, how would I calculate that? Let's say yield strength is 250 mpa, I know that pressure at that depth is 30 bar, I also...

Any help is appreciated, I'm really just trying to figure out if it can withstand 300 meters but it would be useful to see how/if a max depth can be calculated. diameter: 20M steel density: 7850 kg/m^3 weight: 250,000 kg shell thickness: 2.54 cm density of water: 1027 kg/m^3 How much...

Ok, thanks for all your help. I believe I understand it now.

Ok, thanks for your response, not sure why you think I wasn't giving them credit. So if I understand you correctly the final answer is approximately .06 twh/year (6.0x10^-2). You multiply in all the seconds in a year but then divide out the seconds in an hour to get the units in terms of watt...

If I understand you correctly (doubtful) then I divide 12 billion joules by 1800 seconds and get 6.8 million watts which i then multiply by 3.14*10^7 to get watt hours per year which i then divide by 1,000,000,000,000 to get twh/year of 217. I'm pretty sure that is wrong but hoping its right...

So how do I convert your joule number of 2.1024x10^14 to watt hours per year properly? the first part of your calculation is in watts: 6.67*10^6 but when you multiplied it by seconds in a year your result was in joules, is that right? lol, sorry for some reason I like big numbers.

Hi, I'm trying to calculate theoretical energy generated by a system and I'm not sure if I'm doing it right and if I understand the concept properly. Here is my thinking, any input is appreciated. 12 billion joules of energy generated over 1800 seconds equals roughly 6.8 million watts...

ya i was sloppy and just guestimated my conversion of seconds to minutes... i changed it to be exact and got 3.35. again thanks for the help and double checking me.

i meant thickness of shell not density, your right. i calculated speed based on the fact that i know the object travels ~984 feet and i know it takes ~200 seconds... is that a correct options for estimating speed?

awesome, thanks xodin, that was exactly what i needed. 250,000 of iron would give a density of ~10cm which should hold at 1k ft depth when compared with your example. Also the ball would be rising at an average leisurely speed of 3.6mph (I am aware that none of this includes viscosity) If...

ok, makes sense. i'm struggling to reach a realistic size for this ball. if its made out of iron and i want it to withstand 300m depth, what would be a realistic diameter and weight? i want it buoyant but it does not need to be ultra buoyant. how about 250,000 kg and 10m diameter. that...

ok, good to know the calculations i used are correct. Maybe I'm off on this but a 30 ft in diameter sphere weighing 50,000 kg doesn't seem that light or buoyant to me. maybe i am missing something.

this isn't for a problem in a book, i am trying to mimic the real world as closely as I can. the object would be attached to a wire which would be attached to an object that would be spinning as the ball rises. I'm not sure if that counts as a significant amount of tension because the object...