14,358 reputation
24270
bio website arXiv.org
location Toronto, Canada, eh?
age 26
visits member for 2 years, 1 month
seen 19 hours ago

I'm a cosmologist. I did my undergraduate in space engineering (rocket science) and my graduate degree in cosmology. I enjoy Dark Energy, curvature, and modified gravity, but I mainly focus on inflation.


21h
reviewed Approve Do rainbows have ultraviolet bands and infrared bands?
21h
comment Maximum angle for highway lane change
A back-of-the-envelope calculation leads me to say you should expect the angle to be less than $5^\circ$
22h
comment Maximum angle for highway lane change
The question, therefore, is not what the maximum angle could be, but what your average angle is. Don't forget that people tend to drive in a way that keeps the lane change time more/less constant. That means the faster you go, the lower the angle is
22h
comment Maximum angle for highway lane change
Indeed, if you tell us what the end goal is, what you are ultimately trying to show, we might be able to tailor answers to provide the physics for that end
22h
comment Maximum angle for highway lane change
There's not enough information available for us to answer that question. But anecdotal evidence would suggest they can handle quite a bit. I've seen people change lanes in under half a second.
22h
comment Trajectories in Rindler space with zero net time dilation
Try using $x=vt$. I've got a feeling that might help.
22h
comment Trajectories in Rindler space with zero net time dilation
It's an interesting result and I'd have to see your work in more detail to be sure of anything. You seem to be using Rindler coordinates in a way that I'm not sure they were intended. I have a couple suggestions you could try. Obviously the Earth frame should experience more proper time than the accelerating frame.
23h
comment Trajectories in Rindler space with zero net time dilation
what kinds of $v$ values did you use?
23h
comment Trajectories in Rindler space with zero net time dilation
Could it be that approximating (2) as a geodesic means you have approximated $v\ll c$, wherein you would expect the time dilation to be approximately zero anyway?
23h
comment What physical properties can we measure most accurately?
Minor point, time is not a physical constant
23h
comment generating heat using IR radiation
@gigacyan True, and I suppose it didn't matter anyway since all radiation can produce heat when absorbed.
23h
answered Why is this not considered a perpetual motion machine?
23h
comment Maximum angle for highway lane change
You are travelling at 90km/h and you want to know the angle for a lane change. Estimate how long it takes you to change lanes, then estimate the distance between the middle of two adjacent lanes. Then use that to get the speed perpendicular to the direction of traffic. Some fancy trigonometry will then easily allow you to figure out the angle your car was at
1d
comment Why is this not considered a perpetual motion machine?
If it doesn't defy physics then it isn't considered a perpetual motion machine because those defy physics.
1d
revised How does warped space actually look (visually)?
added 520 characters in body
1d
comment Scalar functions and manifolds
This might be better for Math.SE, since these concepts are all purely mathematical
1d
comment generating heat using IR radiation
It's called optical fibre because it transmits visible light. IR doesn't pass through it so well
1d
revised A conducting metal cylinder enters a region of magnetic field
added details mentioned in comments
1d
revised How does warped space actually look (visually)?
added 43 characters in body
1d
answered How does warped space actually look (visually)?