Head Definition and 391 Threads

Mmmmmm, tastes like chicken.

Hi, Does anyone know where does the velocity head (the v2/2g term in the Bernoulli eqn.) fits in when designing a piping system? i.e, what useful practical information can one have by calculating the velocity head? Thks

Hey guys, what is that ringing sound we hear in our head? I read in a taoist book that if we concentrate on it, it can finally be silenced and we will hear true silence where every sound will be clear but it won't bother through its clarity in the sense of annoyance but it will be beautiful. I...

I ve got this simple problem and I can can not find the solution. Two men play head and tails. Each man flips the coin n times, every time he has head, he should add one point to his score. At the end, they compare the scores, whose score has more points , the man is the winner. A is the...

I was given an assignment involving finding the head to tail bunch differential acceleration of a beam of muons loading onto an RF cavity, and it occurred to me that my understanding of the concept might be keeping me from working the problem. Can somone concisely explain it to me?

A horizontal disk of diameter 12.0cm is spinning freely about a vertical axis through its centre at an angular speed of 72 revolutions per minute. A piece of putty of mass 5.0g drops on to and sticks to the disk a distance of 4.0cm from the centre. The angular speed reduces to 60 revolutions per...

Hey, If you have 3 pipes of different diameter flowing into another.. what needs to be true for the head loss in the 3 pipes to all be equal? ie Hf1 = Hf2 = Hf3 Cheers. :S

Homework Statement A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle Theta2 = 45° from the neutron's initial direction. The neutron's initial speed is 6.6x 10^5 m/s...

Homework Statement When an electric train runs,we are familiar to the sparks at the end of cable connections.Why does it occur?Is it due to voltage fluctuations? Homework Equations The Attempt at a Solution

This guy sets the world record for kicking oneself in the head. I don't think I will enter this one.:smile:

Here's the free-body diagram of a stupid physics problem I had: http://img211.imageshack.us/img211/5081/triangleey9.png When going over this problem both my book and my lecturer say that \alpha = \theta (they actually don't even mention \alpha; they just write it as \theta to begin with. I...

I installed a shower head in a customer's bath tub last week. The customer was not happy with the flow of water coming from the shower--so I removed the shower head and noted the orfice that leads to the spray area in the shower head was only 3/32" in diameter. I drilled a hole enlarging the...

Hello, I am finished with Calc III and now am in a Mathmatical Methods course. For the first day we were given a "Prerequisites Inventory", basically problems we should know. But I can't do most of them! If you can help me with any I would appreciate it.Homework Statement #4 If cos(24)...

I have always seen these books in the stores, and such, and they're 100 on amazon (which is a heck of a lot better than B&N) and i want them, but then again they'll probably shoot right over my head. I'm working through my first year of high-school physics. I have read quite a few books on...

I know I've been asking a lot of questions lately, but here's another. Does anyone know of a way to unclog the jets on the print head of an inkjet printer? I have the kind of printer where the print head and ink tanks are seperate. I've tried disassembling and soaking them in water, warm water...

1 Dec is \frac {dy} {dx} birthday so we spend the night before at a B&B on the Oregon coast. This was view from our window: http://home.comcast.net/~integral50/hecetaHead/HPIM0326a.JPG here is a bad pic of the B&B. It is in the Heceta Head lighthouse Keepers house...

Two submarines are underwater and approaching each other head-on. Sub A has a speed of 12 m/s and sub B has a speed of 17 m/s. Sub A sends out a 1520 Hz sonar wave that travels at a speed of 1522 m/s. ... I already solved for this question ... ... What is the frequency of the sound detected by...

I noticed that my eye brow hair is substantially smoother,softer and healthier overall than my head hair? I know that part of the answer is that we touch and mess with head hair more but there must be another reason - at the molecular level. And is it possible to make my head hair as healthy?

There's a probability question I saw on the web that looks innocent enough, unless you pay attention to the wording: I have two dice. If i roll them until i get a double, which is the most likely roll to get a double on? The answer given is below: The first roll is the most likely. Heres...

Medical Explanation for Major Depression An important line of defense in treating Major Depression is realizing depression is a medical disorder. It’s a BRAIN disorder, not a MIND disorder (although depression effects the mind). A depressed brain is not running on all cylinders. Certain...

what does everyone think of this? although I've never had anything published nor even submitted anything i think i more or less agree with andrew odlyzko: http://www.cbc.ca/technology/story/2006/10/02/tech-peer.html i think journals like those would enable crackpots to get their...

Hello, I'm not particularly looking for the answers in this problem as much as I am looking for the method to the solution. It's been giving me a headache. 1. Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration...

This is something that arose out of a section in Richard Mould's Basic Relativity. He begins SR with his so-called "Physical Threorms (PT)," which are gedanken experiments used to show the effects time-dilation, length-contraction, and the concept of simultaneity in relativity, in that order...

I saw this on a website. Prove that if r and s are positive integers with r > s and gcd(r,s)=1, then gcd(rs , r + s)= 1. I can think of two ways to show this. Using the Euclidean algorithm or by showing that 1 can be a linear combination of rs and r + s. Funny thing...I couldn't do either...

I have a head unit (HU) for my car (Panasonic) with the ability to connect an external CD changer. The HU connection has an 8 pin DIN and a left and right RCA input for the external CD changer. I was hoping I could easily connect the left and right RCAs to my ipod and connect the 12v and...

Question: An airplane, whose air speed is 600km/h is supposed to flyy in a straight path 35 degrees north of east. But a steady 100 km/h wind is blowing from the north. In what direction should the plane head? Here is an answer by someone(is it right?) Vp (vector velocity of the...

why when you cross the 2 hairs http://img148.imageshack.us/img148/8223/image15dz.png the moment you try to break them up, you would see like they are "somehow connected", is that "static electric" ?

do-it-yourself encryption Really don't know where to put this, so thought I'd ask all the fine folks here and see if I get a response. One of the curses of being widely read is that sometimes you remember the subject but neither content nor location of something you read once and would really...

I was reading on this page... http://www.cda.org.uk/megab2/build/pub125/sec4.htm#5.1 ...and I tried calculating head loss using both the forumla given, and the nomogram. Aren't these supposed to give the same result? Or am I missing something fundemental? Because they don't equal each...

Hi everyone, I've got a problem with solving this one. Two spheres X and Y (no mentioning about them being identical in mass but drawn in equal sizes) are about to collide head on. Their initial velocities are +5ms^-1 and -5ms^-1 initially, moving towards each other with X being towards...

hey guys , i am studying about the old combustion chambers. i came across the L head combustion chamber and am confused about the exact position of the spark plug.so please help me out of this.

I'd like to publish this in a peer-reviewed journal, but they'd probably reject it. I think General Discussion is an equally valid medium. "Synthesis of Instant Coffee using Non Heated Water" rachmaninoff PF Institute For Coffee Science* *not affiliated with the...

This is a mental arithmatic question really, but what is the fastest way you have found to multiply two numbers in your head? How many steps does it take you and what shortcuts do you use? I apologise if this is the wrong forum. Examples: 33x24 123x321 9999x6666 etc..

My head perspires more! Is this an illusion caused by my hair holding the water longer, or is it that my head really sweats more? Or both? Why might this be? Because the brain more importantly needs to stay cool?

on a smaller electric motor the motor output shaft is cylindrical with a hex head insert i am just directly attaching it to a small tire is there a certain type of drive shaft that anyone could recommend i thought about using an old allen wrench but had nothing to hold the drive shaft into...

I'm doing a lab on Laminar Flow Elements - Fan Performance Test. So far I have had to find power coefficients (CP), discharge coefficient (CQ) and head coefficients (CH). I've plotted CH vs. CQ, CP vs. CQ and Efficiency vs. CQ. My last requirement is that I "Use the curve fits to...

http://www.msnbc.msn.com/id/9898884/ It just blew me away to think that this goes all the way back to FDR's people. As with http://www.pbs.org/newshour/" on PBS and a few other sources, the chance to watch extended interviews with the people making the news is invaluable. Russert carries on...

In this article it states that, a decapitated head can still be alive up to 10 seconds from removal from the body, and in some cases the practice was stoped on humane reasons, and that animal heads have been transplanted, the article is from wiki so i guess it is well researched, in the light of...

"Power source that turns physics on its head" Welcome. I am curious about what you knowledgeable folks here at PF think, regarding this current event. I searched for any threads which already regard the topic, but found only two with very limited discussion. Fuel's paradise? Power source that...

According to wikipedia, earworm, a literal translation of the German Ohrwurm, is a term for a song stuck in one's head, particularly an annoying one. Use of the English translation was introduced by James Kellaris, an associate professor of marketing at the University of Cincinnati. His studies...

One of my questions say: Designa combinational circuit that accepts a 3 bit number and generates a 6 bit binary number output equal to the sqaure of the input number. Now when it says it wants a 3 bit number as the input does it mean like ABC 000 001 010 011 100 101 110 111 then...

Can somone explain me how solid fuel rockets works? Where should I start the reaction, at the tail or at the head? What fuel is the best?

This is my friend's problem, not mine. I don't know who the guy is, and I'm not telling or answering guesses, because I wouldn't want to embarrass him if I knew him, which I don't. Okay, so... My friend is kind of developing a crush on this guy, and I'm trying to convince her to just nip it...

Math teacher in over his head :) Not so much "over my head" as I don't have as much time as I'd like to research the answers. My 7th grade honors class is doing a project on "How fast is the Space Shuttle in terms of Mach?" (My title, not theirs :) ). They didn't have too much trouble...

Remote Control + Head = further distance? huh? has anyone else noticed this? I'm sure you have? has anyone got an explanation for it? like... when you put your car remote, you get about 10ft more range from it... or a garage door remote, about another 30ft when you put it against your...

there are 3 men. they can see each other but not themselves. there is a piece of birdsh.it on each of their heads. they start laughing at each other. the wisest out of the 3 guys stops laughing, he stopped laughing because he figured he had sh.it on his head. how'd he figure it out?

Guys This is very very serious. Yesterday the time was 1 o' clock when i logged off and went to sleep.At that time i could sense a little pain building in my head but as i lied down,I was thinking deeply on something,simultaneously the pain was increasing and i believed that it was weird and...

I used to have a summer job in agriculture, peeling flower bulbs and also planting tiny little plant shoots, but there are a few things I don't understand.. 1) how do they remove the pit out of olives or cherries and keep the fruit intact, whenever I try to do that they are left mangled in...

okay I know my the top of my head hasnt been exposed to much sun so it will burn easily since I shaved it BUT isn't it good that it gets SOME exposure to sun so that it will build resistance to it? Thanks

I shaved my head to save time/money/energy but now I think I'll let my hair grow back because of the increased risk of skin cancer and sunburns and stuff. Are there any other problems (Like that) that shaving my head could cause? (I mean that aren't appearence-related)