Home Definition and 525 Threads

These are our two cats, the black one is Pepper, the other one is pickle as you can see they both make sure they are comfortable. As you can see the pics are not very good as i am getting used to my camera.

A few days ago I was out for an evening and had several holiday cocktails followed by some rather nice red wine. Feeling jolly I still had the sense to know that I might have been slightly over the limit. That's when I did something that I've never done before - I took a cab home. Sure enough...

Hi, First of all I'm back although none of you will remember me but that's OK; I used to frequent these parts asking physics questions to deal with wingnuts (largely of the creationist variety) but I lost interest in that. I am now writing my first novel, an alternate future history; military...

So I just got out of college and have about 15k or so saved up. My job pays me about 65 k a year. I have no debt and own my car. I'm most likely going to move out of my parents house in a few months. I think it would be best not to buy a house for at least another decade, maybe two, and take out...

Is it really possible to send people to Mars and not risk microbial contamination of any life there ? If the recent discovery of liquid water raises the possibility of life, should any human missions be delayed until this is understood better? ISTM if there are any living Microorganisms on the...

Homework Statement If Mariano throws a 92mph cut-fastball to David Ortiz and strikes him out, how long does it take for the pitch to get to home plate? Compare this to a 81 mph changeup and a 67mph knuckle ball. Homework Equations d= v1*t+1/2(a)(t^2) 3. The Attempt at a Solution...

Hi everyone. I have a question that I would be grateful to receive your insights on. In our bedroom, we have a LED strip running from a typical 12V transformer. We turn it off at night using the controller box, which is in between the LEDs and the transformer. The thing is, a couple of times...

Hi I was wondering if it's possible to make a Casmir device (2 uncharged plates in a vaccum)at home or does it need to be handled in a lab with a physicist operating it ?? And does this actually produce exotic matter/negative energy? What if the plates were 5 meters long in a vaccum??

Homework Statement Actually I have the problem solved but I do not understand how the numerator becomes equal to the denominator in the 3rd step. Homework Equations I have been looking for an identity for arctan but can't find one that seems to match. The Attempt at a Solution My attempt...

I'm setting up an amplifier which is intended for use in a car, and I'm not using it in one. I'm trying to power it through a typical DC 250 volt wall outlet. What kind of transformer should I use? (I'm also trying to power a car stereo with it as well)

just wondering...

The idea of this thread is to make a kind of collection of experiments of important scientific facts that you can do at home. Many students in high school are quite frustrated with science, because they see it as a collection of facts to memorize. The purpose of this thread is to show how many...

I live in a rural area in a third world country. Power problems are very common here. My house has three-phase power. It's quite big so maybe that's why my father used three-phase. It is currently distributed around the house. A phase is assigned to every section. Anyways, I have a problem...

A typical home vacuum cleaner has the following specs Input watts (Electrical) = 1000W Suction = 80 inch H2O Output watts = 100 air watts where as a 12V car vacuum cleaner has Input watts (Electrical) = 100W Suction = unspecified (10 inch guesswork) output watts = unspecified (10 air watts...

I'm looking for a forum(s) for people who have home maintenance issues. Does anyone here frequent any that they find useful and reputable? Would greatly appreciate the recommendation.

Do you have a home lab? What does your lab consist of? My lab mostly consists of electronics tools like an oscilloscope, function generator, various power supplies, meters, and so forth.

Homework Statement A power station generates 100kW of power at a voltage of 10kV. Given that the connecting cables in the primary and secondary circuit each have a resistance of 10Ω, find the turn ratio required for an ideal step-down transformer to bring electrical energy to the home at 240V...

I live in an attic apartment and have been suffering a problem lately. Convection seems to be pushing (nasty kitchen smelling) air up to my apartment from my neighbors who live below me in the same building. This nasty air current primarily seems to be coming from a specific crawl space inside...

I have been on a quest in recent weeks to try and save my small home town. They have hired a Public management firm to do everything for the town council One of the things the PM firm did is to provide a web page for the town named "My Waterloo Indiana." This should not be a problem except for...

enjoy ...

Pardon me if I stated the title incorrectly/ informally. I just want to say about the title is about the 220 V, 60 Hz source (present in our outlets also) in our house by which comes from nearby electrical post. I have four questions in this post/thread so kindly tell me if I need to edit this...

I currently get my electricity from an electric company. I would like to get a windmill installed on my roof to supplement my electricity needs. I want to be able to use the windmill to get as much free electricity as I can, and I would like to continue to keep getting the rest of the...

Hi, i have a 50" plasma TV with a reciever and a home theater system that I want to protect against power surge and anything else needed. I've read about stabilizers, power conditioners and line filters, but i don't know the difference between them. They all seems to do almost the same things...

Is there a way to fabricate semiconductors thigh common materials at home?

I really want one but I'm not sure what to look for. I have lots of experience on normal compound and Nikon inverted compound scope for eukaryotic cell culture but I'm obviously not going to buy one of those for my house. It'd be nice If I could use a camera with it too. I don't want to have it...

Why is it possible to do this experiment at home and still see light as a wave? Isn't there loads of interference? Or does this have to do with wavelength? If you use a laserpen and 3 needles you can basicly do it at home without shielding off anything...

Hi, I wonder if you guys could help me. During the summer I used a mould spray on upvc windows which contained anionic surfactants with chlorine bleaching agents. I rinsed this off but it left a white film on the glass and so I used a household cleaner called Flash which has < 5 % Non-ionic...

Looking at different graduate programs to apply to for physics focusing on biological physics. Very different research going on from school to school in the field so most of the criteria I'm basing where I apply is what kind of research is listed. My understanding of the process at your given...

I can't believe I'm actually asking this. I guess my brain has pushed these old details out in favour of new stuff. My son plans to sign up for internet service for his new place. I currently use Iristel DSL (which I think is just repackaged Bell DSL), and have been for the past decade or so...

hi guys and gals been a wild Monday and Tuesday here in the Sydney, Australia region 2 evenings of wild weather first on Monday was a large thunderstorm storm that came in from the west bringing intense lightning, rain and hail Tuesday nite saw an intense low form over the region. This brought...

Would it be possible to capture a gravitational lens with a decent amateur scope coupled to a reasonable CCD?

I want to design a simple home use electronic wacky talky. Please help.

I would like to see the difference between Fraunhofer and Fresnel diffraction with a homemade setup. Has anyone achieved this? In this example, it seems that the main components are a He-Ne laser, a short-focal lens, a pinhole and an adjustable aperture. I have some doubts about the possible...

An introductory picture. Homework Statement Its number in my physics exercise book is 1.147. (just for reference, though completely unimportant). The actual problem description is written below. An airplane is flying from point A to the point B which is 400 km west from the point A...

Questions about how useful surge protectors are. 1) Why is the circuit breaker not effective in acting as surge protection? 2) At home if for example I have my computer connected to surge protector, and surge protector connected to wall outlet. Then there is a sudden voltage spike in the...

Do you guys know of any physics experiment that I can do in my house? Please reply soon thanks.

I have a portable generator for my home. it puts out a total of 80 amps at 240v with no problem. what it does not have is a single 80 amp connector. I have a 50amp and a 30 amp. my plan is to connect these both to the CB in the transfer box to attain the full 80 amps to my home. a local...

I just saw this video and wanted to share it. It contains some pretty awesome plots of the motion of galaxies in our neighborhood. Here's a longer video made by the same person:

At this old thread: https://www.physicsforums.com/showthread.php?t=362716 the reply: Now, whether this extra current matters depends on why the power supply voltage is dropping. If it is due to excessive current, then yes, increased current in one house could cause a slight drop in voltage...

I don't often get excited about doors, but this is pretty neat! https://www.youtube.com/watch?v=umfvm8I9_oU

Hi all, I'd like some advice on subwoofer placement for new home theater. It is a downward firing sub, with the port also being downward and has plastic/rubber feet. It is currently placed on carpet, which is over wooden floorboards as it's on the second floor. I'm trying to minimise the...

I'm a salesman and I have a list of 100 addresses all equidistant from each other and from where I'm standing right now. (I know this is impossible in 3D space but just let's assume it is to make travel times equal). I only have time to call to 10 houses so I want to maximise the chances that...

Apologize in advance for the long post! We are in this particular situation and, being a novice with electrical- related issues, would greatly appreciate opinions here. After a year long search, we found this nice home in Texas meeting all requirements my wife and I were looking for, and at...

I want to make homemade metalic ink mixing aluminium powder with some binder.And use it with brush or pen to write some text.So tell me the easiest way , the exact proportions ingridients and way of producing

Optical fibres are used to transmit light from one place to the other along curved path in a more effective manner. The optical fibres consist of thousands of strands of a very fine quality glass or quartz of refractive index about 1.7 or so. The thickness of a strand is about 10-6cm. The...

I'm just posting the bare bones of this experiment to begin with, as it was quite the task just to attach all the photos in the proper order. But this is about quantum weirdness, and how it can be demonstrated at home with polarized film, a straight piece of thin wire, and a red laser pointer...

Our family is at the stage where me and my sibling are finding jobs and are gradually moving out since the positions we are getting or looking for are at all corners of the world. My parents, especially my mother, are finding this very depressing. Is there anything I can do to make it easier for...

Hi everyone! I really need your help on this one.. My boyfriends birthday is in about a month and I'm kind of clueless about what I need to get him for what I'm planning. He's a student of computer sciences and loves programming and a little of home engineering. Lately he has been nerding...

What is it controlling and What devices are in the loop