Advise Definition and 88 Threads

Simple Harmonic Motion Question... Advise required please! A vehicle engine has a stroke of 180mm. The motion of the piston is simple harmonic. calculate max linear velocity and acceleration at 4200rpm? Calculate max force to the crankshaft if the piston has an effictive mass of .35kg at an...

Air with temperature of 80 F is forced with a speed of 30 m/s through a copper tube with length of 1 meter and inner diameter of 2 millimeters. The copper tube has a temperature of -50 F. I want the air coming out of the tube to have a temperature of less than 0 F. Is my design enough or does...

Hey PF Community, the post is a bit longwinded so I apologize in advance! Towards the very end of the Fall semester, I had asked a professor (sort of in a casual tone) if I could do research with him (he works with dynamical systems and mechanics). He replied negatively since my coursework...

not sure why my earlier post never showed, but I'll try again. I'm doing some work to control a pump that's the input to a pneumatic system. I developed a transfer function that defines the plant as the output pressure divided by the input pressure. I also developed a controller: PID&I...

I have been in aviation as a mech/tech for about 20 years. Now 40ish and looking at the possibilities of going into aerospace engineering (aeronautical or electrical or...). Basically I am bored of being a mechanic all the time and want to step up to area of design it and figure it out rather...

Hello all, Doing this week's problem set, I realized that I have become totally lost in my classical mechanics class. Part of the problem is that my other classes are also very time demanding that I end up putting classical mechanics off because it is so dry (for me at least). The other...

Hey I was wondering is someone could suggest a good college level physics textbook. I am currently in a calculus based physics class and I'm finding it hard to keep up with the concepts and also do the problems. i have fundamentals of physics by halliday/resnick/walker 8th ed and it seems to me...

Hi, I'm going to have to have a fairly hectic 2nd year for my undergrad course. I'm accellarating and doing third year Quantum Mechanics and I'm therefore going to try and learn as much as i can before the start of the semester. The course information is listed here...

Im right now entering my third year in Electrical Engineering and I've grown some interest in the area of Power Engineering. For me it's intriguing to know what's behind designing the wiring of a house or a commercial building and how all of the distribution works. Not only in buildings but in...

i'm planning to buy a new laptop... i'll be using it for programming and other computing applications like matlab... friend's recommend 4gb RAM, dell, hp or mac... but another friend tells me that toshiba is better... what I'm sure right now is that i must get a laptop with 4gb RAM and...

Biochemistry major... I need advise on picking a minor... I'm a sophomore majoring in 'Biochemistry & Molecular Biology'. My plan is to pursue a PHD in the bio-sciences (biochemistry, biophysics, bio-engineering) or maybe Nanotechnology. Between Philosophy, Physics, Math, and Computer...

I can't seem to find a good book on motion. I know it's a broad subject, but I'm interested in Newtonian mechanics, full trajectories (with lift, drag, etc.), and basically anything that's not quantum mechanics or special relativity. I'm more concerned with principles that are applicable to...

Hi all, I'm an undergraduate student from Australia studying law and science (majoring in Physics). I'm going on exchange this semester to University of California, Berkeley, where I will be doing 3 upper division physics subjects and one upper division math. I have heard a lot of rumors...

I'm trying to build an explanatory theory that encompasses both the standard and cosmological standard models (isn't everyone ?) I'd appreciate some help with some questions I have; 1) Is there any reason to be sure/confident that the strong nuclear force is not directly linked with...

I currently go to a community college in my home town and it seems I am taking classes that I don't need to really graduate. Should I try to go to another college to finish my schooling? Do I need to do something else? I need all the advise I can get. Please help!

There's this married women at work that, as far as I can tell, is sending me some "signals". Suggestive choice of words at times, sometimes random physical contact, and will absoluetly not stop looking in my dirrection; in fact looking right at me. It's getting almost awkward. Now, I think...

Hey all. I've got some serious mocks/exams coming up and I just can't seem to be able to revise/study for them. I'm only 15 and I haven't previously revised at all for any exam (including KS3 and a couple of official GCSE science exams), however still obtaining good grades. Since GCSE is...

So I'm a senior in high school and I'm just taking pre-calculus as my math class. I want to major in a field in engineering, most likely electrical, but I'm worried that since I don't have a great math background, I will fall behind other students in college. Most of my friends are in AP...

I am unsure of where to begin to solve for my problem since I have no experience with rotating equipment. I have a 280mm rotating shaft @3000 RPM running thru a flat plate 45mm thick with a 300mm dianeter opening for the shaft. Being at sea level the one side has air pressure ratio of 1.000...

hello. i am a student studying in the 11th grade. i have been having problems in physics lately specially chapters such as SHM, waves. if someone could suggest a site which could help me then i'd be grateful. i prefer sites with animations for explanation (detailed). i have tried...

My departments christmas party is going on, just as I am typing this. Should I go? Cons: Ex boyfriend will be there. Today would have been our five year anniversary. The party is across the town. It's cold outside and and I'm quite comfy snuggled up right now. I could work on my big talk...

Here's the quick story... I'm 23, and went to work full-time after graduating high-school. (Mistake, I know). Part of me thought of becoming a pilot, and in fact I did at least earn my private certificate this past summer. But, the way flying is, it's a long road financially, and once you...

Homework Statement Information: The gravity defines the point of equilibrium for the system. The mathematical models you are to find are all movements around the point of equilibrium. The force of gravity is NOT to be included in these models. Numbers used throughout the exercise...

Deleted, double post, please check the other post for my work so far, admins can delete this thread!

I do not have a specific problem to show, but was wondering if someone could give tips on how to see or develop intuition on those eigenvectors for (2x2 and 3x3) matricies, i.e. which are the cases where they are obvious and how to see it, other than diagonal matrices (i.e. only diagonal is...

Hey everyone, My question may show my modest experience regarding research papers legal procedures but i hope i will be excused. I have a reaseach paper i want to submit which i think it may be, or may be not, be of a significant importance. I have not finished it yet and thinking to...

Hi, Here's my situation. I am currently going to Ohio State University. The tuition here is about $11,000 a quarter. I am going to engineering, which is ranking around the 15th in the country. However, lately, I've been thinking of going to college in my hometown of Toledo. I have been...

Dear PF, Could you pls advise me any books where in detail is described Hydrogen atom (relativisticaly). Thank you very much.

In particular which configuration you will advise for memory distribution and in particular i am always puzzled by this cache memory:confused:

Is it better to leave the laptop closed up when I'm done using it or to leave it on and open?

It is about time to take my major classes now. And I can choose different path for my major. My Maths department offer 3 options and 4 emphasis options are pure Maths applied Maths Statistics emphasis are Actuarial science (only with stat) Electrical Engineering (applied maths or stat)...

Tell me please what (simple, 2 year sufficient) project in evolutionary biology or molecular biology will suit me ? I am going to take an Master exam in biology, but there is nothing in head as to what I should do in one of those two fields, please give me some ideas on how and where to go now...

DEC is related to superluminal acoustic modes. I can not understand. Help me. Thanks.

Suppose I wanted to build an aircraft that would be powered by home made LPG-powered jet engine. It would have to carry at least 180 lbs for a pilot plus fuel and all that stuff. If I wanted to fly this thing - what license would I need (FAA or any other 3-letter place)?

with the release of half-life 2 and about a year since i got my last chunk of computer, its high time i got a new one. I am aiming to get at least 30 frames per second on the newer 3Dgames like Doom3 and Half-Life2 with most of the details on (im currently getting 3-12FPS on doom3 on the lowest...

Hi, it is my first year in electronic engineering. I'd like to focus on subjects that are related to my job and I need your advice. Could you advise me an introduction book which will make me like the content of what I'll be working on for the rest of my life? Or related websites, a circuit I...

Hello all, I'm really really trying hard to quit smoking. Everyone around me seems to have cancer now of various types and it's a constant reminder to quit. So, on my way home from a meeting I threw my pack out the window and decided to go cold turkey. So, now it's been 1 hr since i haven't...

Hi all, can somebody advise on this, Equation: P (change in pressure) = p (density of gas)*w*v*s(max displacement amplitute) P = pwvs Needed to know, is the density of gas always at 1.29kg/m(3)? I've this following qeustion: A piston at one end of a long tube filled with air at...