427 reputation
510
bio website greatPixelHunt.com
location Duluth, MN
age 31
visits member for 2 years, 6 months
seen yesterday

2014/04/23: I develop Emergency Medical Services (EMS) software for Sansio/Physio to enable EMS personnel to track patient encounter data in the field and notify hospitals of incoming patients in real time.

I'm also launching Great Pixel Hunt as a side project. This is an online sweepstakes where businesses pay to reach local users and local users/charities win the majority of those profits.

2011/09/28: Working at my 2nd software-development job full time and working on my 1st web-site and spending time with my wife an baby girl in my free time. I look forward to the day where my "full time" becomes my "free time".


Jul
15
comment Can an object reverse its direction of acceleration even though it continues to move in the same direction?
@dmckee How about the direction of a when |v|=c?
May
23
awarded  Notable Question
May
10
awarded  Yearling
May
7
awarded  Commentator
May
7
comment Acceleration of two falling objects with identical form and air drag but different masses
@VolkerSiegel Nice going! It is interesting that they both hit the peak at the same time but that the lighter one had a lower peak. If you started them at the same speed, then the empty box must have decelerated faster early on (air-resistance?), but slower as it neared the peak (buoyancy?) than the full box did.
May
7
comment Acceleration of two falling objects with identical form and air drag but different masses
@VolkerSiegel Air resistance does play an increasing role as speed increases, but it is not the driving force at low speeds. To prove this, simultaneously throw an air and lead balloon upwards slowly at the same initial speed and observe which one reaches the top of its arc first. If air resistance was the root cause for the change in acceleration, the air balloon would reach the top of the ark first. However, the opposite is true.
Apr
23
comment Magnetic Levitation For Space Travel
I looked into liquid oxygen which has a density of 1,141 kg/m^3, 1.141 times that of water, much closer than the twice dense perfluorocarbon. The problem is that it can't be in liquid form above -113C, so it wouldn't be an option in liquid form. However, air at sea level at 15C has a density of 1.225 kg/m^3, so if we increased the pressure 800 times, the air would be the exact density of water. Deep see divers regularly do 10 times, but it would be interesting to know the true limits if the oxygen levels were controlled perfectly.
Apr
23
comment Magnetic Levitation For Space Travel
@DoryanMiller Correct, as without FTL the trip will take a minimum of 8.4 years to an earth observer.
Apr
23
awarded  Autobiographer
Dec
12
awarded  Popular Question
Aug
8
comment Magnetic Levitation For Space Travel
Thanks for the answer. For the time calculations, I was using the "Long Relativistic Journeys" portion from this page for 4.2 ly and multiplying by 2 for the return trip. For the acceleration, yes you still accelerate, but I was thinking that ideally every atom in your body would accelerate equally 149 G's by the "levitation" forces so that you'd only feel 1 G of the 150 G's you actually accelerate at. Obviously getting every atom to participate is the trouble...
Aug
7
asked Magnetic Levitation For Space Travel
May
30
answered What is the Earth truly rotating about/revolving around?
May
10
awarded  Yearling
Mar
28
awarded  Notable Question
Mar
28
awarded  Good Question
Mar
27
awarded  Popular Question
Mar
27
comment How long can you survive 1 million degrees?
@JoeZeng Done, thanks for the suggestion!
Mar
27
awarded  Nice Question
Mar
27
asked How long can you survive 1 million degrees?