/sci/ - Science & Math

God dammit, pop or scrub already. I need to go to sleep.

>>9207519
>be currently in a linear algebra class at a decent community college
>first day of class the professor shows up 30 minutes late
>he walks in looking like a middle eastern version of Brendan Fraser after his midlife crisis
>starts talking about how he just got back from a trip in Europe and that he makes a lot of money from stocks
>proceeds to tell us that he has mafia connections and had to call in some favors from some friends in high places
>he was apparently supposed to be in jail for a minimum of 10 days for some accident he caused.
>second day he cancels class
>third day he claims there is a massive accident on the freeway so class starts an hour and a half late
>he walks in and bumbles around telling us to read the first few chapters of the book and that we are going to just skip ahead to the real meat and bones of linear algebra
>he rambles about vector spaces for about 30 minutes and goes for a "15 minute" break.
>doesn't come back until class is over

This fuck has spent an entire week doing the same fucking p^2 to p^2 vector space transformation and then complains when people don't know shit about the material.

I have a story for pretty much every day I've ever interacted with this degenerate

bump

Has anyone on /sci/ ever experienced a phenomenon known as "The Hum," or have thoughts on the cause of this phenomenon?

https://en.wikipedia.org/wiki/Talk:The_Hum
https://hummap.wordpress.com/

Several months ago, I started hearing a somewhat faint rumbling sound that I couldn't localize. It's like a bulldozer idling in the distance. The sound contracts rhythmically, like a pulse. There's the faint idling bulldozer sound for a second, then a second of silence, then the bulldozer sound again, etc.

The sound occurs sporadically at different times of the day. Some days, it could start as early as 10 AM, but it usually begins around the afternoon. The sound drones on until 1 AM or 3 AM, then it seems to cease for the rest of the AM hours. The sound endures for several weeks, sometimes a couple of months. Then it ceases entirely for several more weeks before starting up again.

The sound is worse indoors than outdoors. While indoors, the sound becomes a more intense rumbling. Earplugs and earmuffs do nothing to block it - the sound rumbles through them. White noise generators and music do help to drown out the sound. Plugging my ears with my fingers also curiously helps, if only because this produces some kind of pulsing that drowns out the sound.

Some people I've asked can also hear the sound, but some others can't.

I've made several efforts to locate the sound. At first I honestly thought there was some sort of construction occurring on a neighbor's lot, but I haven't seen any construction vehicles anywhere in the vicinity. I also used Google Maps to check dozens of square miles around my neighborhood. There's no construction, no factories, nothing that could explain this disturbance.

Driving some distance away from my neighborhood causes the sound to cease, but I can't get a more precise idea of where exactly it begins or ends.

>>8477192
yeah, that's what it means in a sterile math sense, but what does a solution of one of these equations mean in the context of the physical world?

>>7959768
OKAY SO truss guy here. Royally fucked up my thought process.

tl;dr is that i need to design a truss that can support a load of 1000 lbs of pressure applied at the top middle. (or 4 inches from the middle on each side but the middle is probably simpler)

So, I was looking at a bridge truss design, when in reality I should have been thinking of more like a roof truss design.

So does anybody have any good suggestions for a roof design? I'm kind of limited to a design without a pointed top, so probably something with more of an arch. (Which, since I'm applying the force to the middle anyways with a machine, probably for the best)

Been grinding my head on this a while, but feels extremely limiting trying to get my load down given the constraints of my measurements. (22" by 7")