349 reputation
210
bio website switchb.org/kpreid
location United States
age
visits member for 2 years, 9 months
seen Apr 5 at 21:45

Nov
4
revised Is an electron/proton gun possible?
capitalization in title, throw in a link
Nov
12
comment Flat poster on a wall gaining curvature over time
Looks like it just stretched out under its weight (or the upper mounting sagged/tore), and the curve is only because it was constrained by the lower pins.
Aug
18
revised How does a car turn without any skidding?
more specific title
Aug
18
suggested suggested edit on How does a car turn without any skidding?
Jul
10
awarded  Yearling
Jan
25
revised Why is the energy density of gasoline so high?
fix 2 misspellings, other copyedits
Jan
25
suggested suggested edit on Why is the energy density of gasoline so high?
Jan
21
comment Electrical flow in a simple parallel circuit
@James: The error in your comment is that the voltage drop for each is 3V only if they were in a series circuit. This is a parallel circuit, which is not the case where that rule applies. Think about this: Given some reference 0V, you can assign a specific voltage to every node (i.e. wire/junction) in the circuit. Voltage drops are the differences between nodes. In your example, there are only two nodes, so the drop across all of the components must be 9V (or -9V if you take the difference in the other direction). This is equivalent to Kirchhoff's voltage law — I suggest trying that out.
Jan
19
revised How can I create hindrances to radio waves?
grammar, capitalization of question
Jan
18
suggested suggested edit on How can I create hindrances to radio waves?
Jan
15
comment How long does it take to weigh an uncooperative mass?
This is definitely in the right direction; the need to choose $\bar{a}_{max}$ is the hole. There is a $d$: the height of the box — that's why the box exists.
Jan
15
revised How long does it take to weigh an uncooperative mass?
oops, the downward mass would have to be constant accel, not constant velocity. Also expand intro.
Jan
15
comment How long does it take to weigh an uncooperative mass?
I'm assuming an ideal scale, so the center of mass isn't a problem, and I want an upper bound on the error more specific than ‘it will improve over time’.
Jan
15
answered Should you run when under rain?
Jan
14
revised How long do reflections take?
use superscript instead of 'e' notation (this changes value by a factor of 10 but matches the author's comments)
Jan
14
suggested suggested edit on How long do reflections take?
Jan
14
asked How long does it take to weigh an uncooperative mass?
Jan
2
comment How to guess the content of a christmas present?
(1) No, you can get information about the mass distribution from the gravitational field; consider the mapping of lunar mascons, which according to that article was done just by analyzing the trajectory of a probe. (2) MRI gets you a 3D image, i.e. size and shape of different regions, and apparently some information about composition as well. (I don't have any background in these topics so I'm not providing much detail; consider this to be existence, rather than constructive, proof, if you will.)
Dec
31
answered How to guess the content of a christmas present?
Dec
19
revised Can temperature be defined as propensity to transmit thermal energy?
fix one \partial without a \, touch up caps/commas too