2,370 reputation
923
bio website infosecfrog.blogspot.com
location Scotland, United Kingdom
age 42
visits member for 3 years, 1 month
seen Apr 11 at 17:18

Nov
27
comment
@Crazy - why would you plan to comment on someone else's downvote? Are you telepathic? We can encourage users to vote, certainly, but if they don't then that is their call.
Nov
8
comment How realistic is the game “A slower speed of light”?
Excellent question - and thanks for the link. I'm going to look at that one this weekend. After Devil's Tuning Fork, I have been trying to find games with differing perception rules. devilstuningfork.com
Nov
7
comment What else does the fabric of space-time do?
@Nick1o2 - I think you might need to revisit what you understand by 'fabric of space time.' It isn't actually a thing, it is a term writers use to try and help the lay-person understand some of the aspects of physics which aren't necessarily intuitive.
Oct
12
comment what would my path look like using the sun for navigation
Correct, in fact it only will twice a year.
Sep
28
comment Is Earth's orbit altered by recoil from take-off/launch/recovery of aero/space vehicles?
The simple answer is yes. By an incredibly small amount, especially as most of the mass returns to earth.
Sep
6
comment Infinite Energy from Bobbing
sorry @JohnK - not going to bother - it is way too trivial. Look up any description of real world losses in dynamic systems.
Sep
5
comment Infinite Energy from Bobbing
very simply - neither of your equations is true in the real world. You need to add in a term for losses such as friction in the rubber of the balloon, turbulence in the air when it is moving past balloon or propellor etc etc etc
Sep
5
comment Infinite Energy from Bobbing
no, I'm bringing my common sense to bear: everything costs energy.
Sep
2
comment Infinite Energy from Bobbing
no- no there shouldn't. every process loses some energy in heat, turbulence, drag etc. so you will never generate more potential energy.
Aug
18
comment What is physics of a normal jump?
Can you explain what you mean? What kind of jump? If one exactly like in your image, what part of it is mimportant? There are a lot of aspects to take into account, so if you can give context that would help.
Aug
8
comment If the universe is infinite, shouldn't I already have been contacted by a time and space travelling doppelgänger?
I read the q but like I said your linkage between paragraphs three and four doesn't work for me.
Aug
8
comment If the universe is infinite, shouldn't I already have been contacted by a time and space travelling doppelgänger?
Infinite doesn't have to mean everything happens. Infinite is weird like that. Time travel may be a physical impossibility - an infinite universe won't change that.
Jun
23
comment How does one measure velocity in space?
Okay - so just measure relative to whatever you are wanting to use as a reference point. If you want it relative to you, you could use a laser doppler measuerment. If you want Beagle's speed relative to a point on Mars, just measure it the same way you would on earth: triangulation
Jun
23
comment How does one measure velocity in space?
Why do you think velocity should be connected to Earth? The definition doesn't mention Earth at all- Definition: Velocity is a vector measurement of the rate and direction of motion.
Jun
11
comment Finding instantaneous speed in MPH given acceleration, RPM and gear ratio
There you go @Alexander - I couldn't find any specific issue with the previous website, but happy to change.
Jun
7
comment Do you pay more for gas when the day is warmer?
But your engine is much more efficient with cold air - as it is more dense. Wonder where the two curves would balance out :-)
Jun
3
comment Why do rockets accelerate fastest horizontally?
But surely you need to take the most obvious case - which is from zero to x seconds. If you take too long, the rocket will have hit the ground (as per your answer) and as that will happen relatively rapidly, terminal velocity is not really going to become a major factor here.
Jun
3
comment Why do rockets accelerate fastest horizontally?
But you will also hit terminal velocity in the other directions as well. It will just take longer as acceleration is lower.
Jun
3
comment Why do rockets accelerate fastest horizontally?
QI does get things wrong - sometimes they admit their mistakes on later shows, other times they don't. :-)
May
24
comment Crushing a magnetic field
and the field density would increase :-)