Head Definition and 391 Threads

Hello, I need to know what linear acceleration and angular acceleration of head is. This is not for physics, this is what I'm thinking, if I'm wrong please correct me and tell my why not Shaking head-angular acceleration Tilting head back- angular acceleration (Just in case this becomes...

Hey everyone, I've got a problem here and I'm looking for a simple solution. Basically, I need to keep a consistent hydraulic head between two points of a vertical drainage pipe. I have a sump pump and two electronic float valves (that I purchased separately). What I want to do is wire the...

Hi guys, i have read and read and read all this stuff about x=vt(cosA), y = vt(sinA)-1/2gt^2 now i am not a pyhsics guy and never claimed to be, i am a programmer. This is what i am trying to accomplish. I am trying to write a small VB app to calculate velocity of a golf club head. I and...

Given that we humans are descended from the great ape, as well as are gorillas and chimpanzees and bonobos, why do we have hair that grows indefinitely, while they do not? I've read something about a sexual selection aspect to evolution, surmising that hair is a means to finding a mate, like...

Its probably been done previously but a search didn't return any results for me. But anyway, Vehicle 'a' (Va) travels head-on into Vechicle 'b' (Vb). Both are traveling at 50mph. Both vehicles are identical in weight, tyre grip, transmission, general design, road surface etc. Is the...

So I went a bit overboard this semester and took 4 math courses and a fifth math-based course, and while 80% of the courses went well, one didn't. I took an upper level statistics course because I liked the professor, and it's one of the core courses at my school if you wish to do an honors...

Hi, new to the forum, although i have read some posts before. I am in the process of completing a structural mechanics report based upon buckling of a slender column. In the brief they asked us to plot a graph of Critical Buckling Load derived from Euler's Buckling Theory and actual (all...

Homework Statement...

i need some help becoase i become confused according to pump characteristic curve if the flow rate increased the head will decreased the question is how i can increase the flow rate and what is the relation of RPM with head and flow rate

Hi, I'm having trouble producing 22 AWG polypropylene cable. I keep on getting "missing insulation" and "reduced insulation". The Extruder Head I'm using is quite old and I'm not sure that it is "centered". But a mechanical engineer told me not to worry, it doesn't mater if the Head is...

Hi, I'm having trouble producing 22 AWG polypropylene cable. I keep on getting "missing insulation" and "reduced insulation". The Extruder Head I'm using is quite old and I'm not sure that it is "centered". But a mechanical engineer told me not to worry, it doesn't mater if the Head is...

Say I push down on a very large drum head that lies in the z = 0 plane at equilibrium. Suppose there is no friction between my finger and the drum head. Suppose my finger tip pushes the drum head down some distance d. Suppose I accelerate my finger tip to some constant velocity v in the x...

I recently ran across a couple of comments to http://news.yahoo.com/s/ap/20100817/ap_on_sp_fo_ne/fbn_head_injuries_als" As an athlete who's had several head injuries over the years, but one who has never eaten cycads (that I know of), what might I expect? What should I do? Avoid brown...

In my book, it says that the Binomial Series is \sum_{n=0}^{\infty }\binom{n}{r} x^n Where \binom{n}{r} = \frac{n(n-1)...(n-r+1)}{n!} for r\geq1 and \binom{n}{0} = 1 Now here is where it got to be, I know that the \binom{n}{r} = \frac{n(n-1)...(n-r+1)}{n!} were derived through the...

How do you visualize the spin of electron in your head? I can’t imagine such a vector which has the same projection in any direction and at any time. Is it an understandable object in three dimension?

Hi Please look at this link. It is only very brief. It describes how to extract iron from iron oxide on a match head. My questions are: where does the carbon come from in this equation Iron(III) oxide + carbon → iron + carbon dioxide 2Fe2O3(s) + 3C(s) → 4Fe(s) + 3CO2(g) Is it...

I've noticed a number of threads asking about sleep paralysis, and especially loud noises when falling asleep. I found this article and thought others might be interested. http://www.livescience.com/health/sleep-disorders-top10-100208-1.html The "loud noises" is a disorder called...

Homework Statement A circus acrobat of mass M leaps straight up with an initial velocity of vo from a trampoline. As he rises, he takes a trained monkey of mass m off a perch of height h above the trampoline. What is the maximum height attained by the pair in terms of M, m, Vo, h, and g...

I have a frequency response diagram(frequency vs head) of discrete values. I have to perform Fourier analysis on these discrete values. The resultant frequency and head should be in FREQUENCY DOMAIN. how I can do this... by using FFT or any other ... using Nyquist frequency... please tell me...

My friend was in a head-on collision this week. They were traveling approximately 35 mph. A car collided with them head-on traveling at approximately 30 mph. The airbag deployed, and the impact caused a tremendous contusion on my friend's forehead, but no skull fractures. It's been years since...

Why does a tornado vortex go down to Earth instead of up to the atmosphere? Sounds stupid I know, but answer the question if you can.

Okay, so I've been wondering about the Galileo experiment for some reason and I can't get my head around how it would work under different circumstances. 1. Is Galileo's experiment only valid in vacuum or is it valid for all kinds of fluids? Also, must the two objects be of the same...

I am working on a project at my summer internship rerouting some duct work and want to do some calculations to see how much changing some of the 90 degree angles in the duct will improve flow. I don't have my Fluids text with me and was wondering if anyone knew of any good references online to...

Hi, I have this thing where if I see someone this really negative thought about them will pop into my head about them, independent of my will, and it's growing in consistency. It'd be something awful like "you're so ugly" or "wow you're fat". Really disgusting stuff. It's turned into like a...

Hi, I'm trying to learn stuff for my relativity module, and it goes on about spacetime and the 4-dimensional continuum and four-vectors and all that business. I am having trouble imagining whatever it is I am supposed to picture when people talk about this. Take this thing, i believe its...

Hi there was wondering if some one could help me? I think i understand what a gaussian is, its a normal distirbution where the distribution of data symmetrically tails off from the mean in both directions. I have been looking at FTIR error analysis and have constantly read that error is...

So my junior year is winding down, and now is the time for me to start applying to grad schools. The problem is that I'm not sure what subject I want to enter into, much less which schools to apply for. Currently, I am completing a B.S. in computer science and a B.S. in psychology with a...

If we have an open pipe system that will deliver in total 200 gpm divided in 2 pipes the first pipe is 50 gpm and the second is 150 gpm , the 2 pipes have the same length , if we want to size the pipes where both pipes will have the same diameter , if we do that through william hazen equation...

I need some scientific assistance. A woman at work had the misfortune of a box falling and hitting her head. Fortunately she was fine, the box was not heavy and she had no injuries. Two years later i have a solicitors letter demanding money for fictitious injuries. Is it possible to get an...

For A coin that comes up heads independently with probability p on each flip what is the variance in the number of flips until the kth head appears ?

Hi, I'm trying to work this problem out and unfortunately my book doesn't have an explanation. Homework Statement A match head is rubbed a distance d over a rough surface in order to increase the temperature to its flash point. If the patch head material has a mass m and a specific heat...

Homework Statement A pedestrian is running at v=6m/s (continuously) to catch a bus that is leaving from 16m in front of him. The bus pulls away and accelerates (from rest) at 1m/s/s. How far does the pedestrian have to run to catch the bus (if at all)? V pedestrian=6m/2 acceleration...

Hi all, I got the system (attached below) and I am trying to work out the following (at point x-outflow): -net head of the system (I guess this isn't really at point x) -flow rate -pressure I know the flowrate and pressure at point Y, I also know how high the water in the tank is at...

Anyone here a dead head? There's really no point to this post, so i won't be surprised if it gets no replies. That said, I was listening to The Weather Report Suite earlier today, and I was suddenly overcome with (albeit vague) application of Fourier analysis to the interpretation of this song...

Sorry, not so much of a problem, more. . I need to understand. Homework Statement Finding the net head. This website (http://www.oregon.gov/ENERGY/RENEW/Hydro/Hydro_index.shtml ), says that the gross or "static" head is the vertical distance between the top of penstock and the point...

When 2 particle beams meet head on, more energy is avaliable than when the particle beam is directed at a fixed target. Why is this? My textbook gives an explanation which I don't understand, involving rest mass energy. Any alternate explanation or explaining the one given will be great...

Well I have literally zero programming experience and I am a freshman so I decided to take a Java class. Problem is that I heard the intro class is an absolute joke and I don't really want to waste time on it. The next prerequisite for the intermediate class is only "the equivalent to a High...

Hello, Say you have a function f on the domain R^n, and an integral transform P which integrates f over all possible straight lines in R^n. I am lead to believe that the range of this is R^(2n), or a tangent bundle, which I am having MASSIVE problems visualising! Am I right in saying the...

Homework Statement Two remote control cars with masses of 1.11 kilograms and 1.81 kilograms travel toward each other at speeds of 8.75 meters per second and 3.39 meters per second, respectively. The cars collide head-on, and the less massive car recoils with a speed of 2.99 meters per second...

The modes of a circular drum head are described by Bessel functions and sines and cosines, but without getting into all that, one can making the following statement: the nodes are circles concentric with the center of the drum, and are also evenly spaced lines that run through the center of the...

Who can help me call BS on the physics of something I just watched on TV. Ok let me clarify that statement, of course 90% + of what's on TV is BS but this particular show is a documentary style that so far seemed reasonably well grounded in fact (though at times somewhat contrived). The show...

Homework Statement Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance D_A beyond the starting line at t = 0. The starting line is at x=0. Car A travels at a constant speed v_A. Car B starts at the starting line but...

At an oil refinery, a mobile centrifugal pump is used to pump warm crude oil from a storage tank. Liquid level in tank at elevation of 3 metres above pump. Suction side of pump is fed with a flexible hose that is 10 metres long. Crude oil density: 846 kg/m3 Crude flow 4000 kg/h Internal...

http://www.fourmilab.ch/cship/timedial.html Gives a formula for time dilation which is repeated in many other soucres. In this version t'/to increases with v. Its time dilation time is meant to slow? http://www.phys.unsw.edu.au/einsteinlight/jw/module4_time_dilation.htm A useful set of...

ruh roh http://www.huffingtonpost.com/2009/08/26/microsofts-ad-in-poland-p_n_269366.html I couldn't resist making an animation from the 2 images. Now if I could just make the heads morph...

If a apple falls on my head, what is the physical value that makes my head hurt?

I know this problem has been posted before, but I think my answer is correct and I want to know why it was considered wrong! Homework Statement Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance Da beyond the...

Homework Statement OK - the problem is thus: In an inertial frame two observers (called a & b) travel along the positive x-axis with velocities Va and Vb. They encounter a photon traveling in the opposite x-direction. Without using the Lorentz transformations, show that the ratio of the...

http://library.thinkquest.org/10796/ch1/ch1.htm I have some down time for the next 3 months and figured I might as well do something constructive and teach myself physics. I am doing so on thee above website, but question 2 on section 3 has me stumped. This section is about when and how...

Hi guys. Right now I'm 14 years old. All my friends say I have a big head, and quite frankly I do (I'm referring to physical size not actual having a big ego). I'm really tall for my age too, I'm 6'3. I was wondering if it's natural for people to have a big head an grow out of it. When I was...