Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Latest activity
Register
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
PeroK's latest activity
PeroK
replied to the thread
I
A. P. French: Matter and Radiation: The Inertia of Energy
.
What specifically is not clear? Once you get the idea that light has momentum and that the centre of mass should not move, the...
Today, 12:13 AM
PeroK
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
I think the binomial method is quite general and easy to remember: $$x^2 + y^2 = \frac 1 2(a^2 + b^2)$$$$x^4 + y^4 = \frac 1 8(a^4 +...
Yesterday, 2:18 PM
PeroK
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
I saw my method more as jujitsi than brute force!
Yesterday, 12:16 PM
PeroK
reacted to
pinball1970's post
in the thread
RIP Bernard Hill 1944-2024
with
Sad
.
Below is portrayal King Theoden in Lord of the rings. I remember him first as “Yosser Hughes” in the UK 1980s drama, “Black stuff.”...
Yesterday, 7:54 AM
PeroK
reacted to
Baluncore's post
in the thread
What is global warming due to?
with
Like
.
The debate is over. We have had many ice-ages since the dinosaurs. The continents have drifted to, and from the poles, along well known...
Yesterday, 2:42 AM
PeroK
reacted to
Ibix's post
in the thread
I
Post Big Bang Gravity
with
Like
.
Our current models suggest that the universe started in a dense state. Gravity didn't have anything to do with making it that way...
Yesterday, 1:53 AM
PeroK
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
Note that: $$(m+n)^3 + (m - n)^3 = m^3 + 3m^2n + 3mn^2 + n^3 + m^3 - 3m^2n + 3mn^2 - n^3 = 2(m^3 + 3mn^2)$$Where the RHS is twice the...
Yesterday, 12:25 AM
PeroK
reacted to
Mark44's post
in the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
with
Like
.
I don't see anything wrong with this approach, so I wouldn't describe it as bad. I think it's the most straightforward way to go about...
Yesterday, 12:14 AM
PeroK
reacted to
Ibix's post
in the thread
Stargazing
Dark matter and its effect on the orbit of stars
with
Like
.
Black holes have been considered, yes. You need more than thousands of them - you need more mass in them than there is in the visible...
Yesterday, 12:09 AM
PeroK
reacted to
Mark44's post
in the thread
Eigenvalue of matrix proof by induction
with
Like
.
Right. The induction hypothesis in this case is assuming that ##B^m\vec x = a^m\vec x## is true. Using this hypothesis, you show that it...
Yesterday, 12:03 AM
PeroK
replied to the thread
Is the criteria for the present perfect tense in textbook inadequate?
.
Whatever you call it, "should have" is not a simple tense, but involves some sort of condition. And should is a "modal" verb. Along...
Tuesday, 7:23 AM
PeroK
reacted to
marcusl's post
in the thread
Is the criteria for the present perfect tense in textbook inadequate?
with
Like
.
I should have specified, since PF emphasizes providing references. The Cambridge Grammar of the English Language, 2002, contains an...
Tuesday, 7:17 AM
PeroK
reacted to
sevensages's post
in the thread
Is the criteria for the present perfect tense in textbook inadequate?
with
Skeptical
.
Where did you learn this? I have a copy of the textbook Warriner's English Grammar and Composition with me. The Warriner textbook is a...
Tuesday, 7:16 AM
PeroK
reacted to
marcusl's post
in the thread
Is the criteria for the present perfect tense in textbook inadequate?
with
Like
.
The reason it doesn’t match is that it’s not the present perfect tense. “Should “ is a modal verb expressing expectation or obligation...
Tuesday, 7:16 AM
PeroK
reacted to
PeterDonis's post
in the thread
I
Why doesn't gravity cause double-slit decoherence?
with
Like
.
This is not correct. The lab and the experimenter do not exhibit any observable response to the molecule's gravitational field. So they...
Tuesday, 4:01 AM
Forums
Back
Top