Year Definition and 999 Threads

Hey guys, I am currently in year 12 and have been asked to develop a thesis on cosmology for an Extended research task (ERT) and I am bewildered. Nothing is coming to mind at the moment and I am struggling. I have no idea what to do mine on. the teacher gave us a list of topics that we might...

When is the first time a student of physics works with Einsteins field equation and does Friedmann cosmology?

I have a situation and I wanted to know what the Engineers on this forum thinks of it and maybe some advice. i work for a small company. 3 people left including my supervisor. it is now just me and the owner as far as engineers. then just one guy to do packaging. This is one of my first...

I have a desktop with P4 and a gig ram(using right now). I didn't want to take it to my college since it is 1600 KMs from home and carrying a desktop there is follishness(laptop seems to be a better option). So is it mandatory to take computer to college or i can manage even without a computer...

Hi, I've completed one year of undergrad. I started in engineering but have now decided that I want to pursue math. Before continuing, I want to take a year off to refocus and take care of other aspects of my life. I feel like I will do better if I take a year off. On the other hand, I enjoy...

I have a friend who will be starting CC in the fall and he wants to transfer to a four year college eventually. I've been telling him that he'll need a 3.0 GPA and above to transfer and this scares him. I'm doubting my own words about a 3.0. What would you guys think is usually the minimum GPA...

Bromine gas at atmospheric pressure and room temperature has a density of 6.4 kg/m3. An approximate r.m.s. speed of bromine molecules is 216.5 m/s. Experiments show that bromine molecules take about 500s to diffuse 0.1m in air. This low speed compared with the r.m.s. speed can be attributed...

At an altitude of about 100km above the Earth's surface, the density and temperature of the atmosphere are about 10^-14 kg/m^3 and 2000K, respectively. At this altitude, the major constituent of the atmosphere is atomic oxygen. Use this information to estimate the pressure of the atmosphere at...

I've been experimenting for hours, and my LED still won't light correctly when this method is used, and the fluke 87 reads voltage on the circuit in a non-logical way. Can you help? Here's what I have set up when using an online calculator: Time delay: 2000 milliseconds Power supply: 15v...

Homework Statement The Bank of Utopia offers an interest rate of 100% per annum with various options as to how the interest may be added. A man invests $1000 and considers the following options. Option A - Interest added annually at the end of the year. Option B - Interest of 50% credited...

I just stumbled across this on my own. I find that all leap years in the current calendar are multiples of 16. Therefore, to see if a year is a leap year, one need only to divide the year by 16 and see if there is a remainder. If so, the year is not a leap year. If not, the year is a leap...

Hey there... I've been lurking around these forums for about a year now and although I'm not majoring in physics, I figured you guys would still give me some input as to what types of fields I may be interested in pursuing. I guess you could consider this my job research phase of my college...

Two cylinders A and C of equal volume V contain the same ideal gas at temperature T and at pressures 2p and p respectively. A valve connecting the two cylinders is opened slightly and as the gas leaks from A to B, the pressure in A is maintained at 2p by pushing in a piston. The process is...

A vessel is divided into two parts of equal volume by a partition in which there is a very small hole. Initially, each part contains gas at 300K and a low pressure, p. One part of the vessel is now heated to 600K while the other is maintained at 300K. If a steady state is established when the...

An evacuated cubical box of side a is constructed with perfectly reflecting interior surfaces; initially, it is dark inside. A small window is opened to allow light of frequency f to enter the container and is also closed again when the box contains N photons. Suggest what might happen if the...

Question: A stream of particles, each of mass m and having kinetic energy E, is collimated into a parallel beam of cross-sectional area A. The particles are incident normally on a smooth plane surface at rate n and they rebound elastically. Derive an expression for the pressure on the surface...

Question: A square frame of side 10cm rests on a table. Confined within the frame are 500 ants, each of mass 0.001g. The ants rush about randomly with constant speed 0.02m/s, colliding with each other and with the walls. Assuming the collisions are perfectly elastic, calculate for force on each...

Because of the shortcomings that have recently come to light at the physics department (and math department, actually) of my current university, I am considering transferring to a stronger school for my area of study. I'm also a little behind on advanced and degree-specific courses because of...

Hey guys, I am a maths student going onto second year. I wanted to take some physics modules but I'd need some 1st year physics pre-requisites. The topics I need to learn over the summer are: Astronomy Quantum Phenomena Particle Physics Waves Electricity and Magnetism Classical...

This might a lot to digest, but I would be forever appreciative if someone with knowledge could offer any advice pertaining to my future plans: Currently I'm majoring in Mathematics in state university. I'm have two more semesters worth of college and am due to graduate May 13. Last year I...

I struggled in adv alg 2 with trig my jr year. Some of it may have been me not applyling myslef this year. I passed with a C- (77%). How bad is that? And for my senior year I am going to take adv precalculus. People say its a review of alg 2. Is that true? I think the thing i struggle with most...

How to relearn 1st year calculus?? I need to relearn the year of calculus that i took almost 5 years ago. I want to do this on my own if this is practical. I definitely have the discipline to sit down and spend the time doing this, but I really need to know at what point i can say, "OK, I now...

Derive an expression for the number of impact of gas molecules on unit area in unit time in terms of the number of molecules per unit volume, n, and their mean speed, <c>. Explain the assumptions you make. A disc of radius "a" rotates with constant angular velocity "omega" in a gas at low...

Hi there I want (have) to work for a year before commencing PhD. I want to do PhD in astrophysics. Can any1 advise if it is reasonable to expect that I might attain a job even loosely related to astrophysics for the year? And also how I might go about looking for such job positions. (my...

Guys I'm weak in heat and kinetic theory, so I'm going to need extra guide and pointers from you guys to solve this and the coming questions. Thank you. Question: A pond of water at 0 degrees Celsius is freezing. The thickness of the ice layer is h and the top surface of the ice remains at a...

Below 20K, The specific heat capacity c of silver varies with temperature according to the equationc/\text{J /kg /K} = 1.5x10^{-4}(T/K)^3 + 6.0x10^{-3} T/K. If a small silver sphere of diameter 4am and at 20K is placed in 25g of liquid helium at 4K, what fraction of the liquid will evaporate...

Guys I'm weak in heat and kinetic theory, so I'm going to need extra guide and pointers from you guys to solve this and the coming questions. Thank you. A constant-volume gas thermometer of volume 0.001m3 contains 0.05mol of a gas and is used to deduce values of temperature on the assumption...

Guys I'm weak in heat and kinetic theory, so I'm going to need extra guide and pointers from you guys to solve this and the coming questions. Thank you. Question: The bulb of a constant-volume gas thermometer has a volume V and is connected by a long narrow capillary tube to a manometer, where...

A model of the carbon dioxide (CO2) molecule is constructed as shown in Fig. SM10.1 Two sliders A and C, each of mass M, represent the oxygen atoms and are connected by light springs, of force constant k, to a slider B of mass m, representing the carbon atom. All three sliders are placed on a...

I would appreciate if we could discuss the questions together. It's a very interesting question indeed. Question: The singly ionised hydrogen molecule H_2^+ can be regarded as an electron of charge -e moving in the field due to two protons, each of charge +e. The protons, which can be...

I thought that this was an interesting idea. Basically, Alan Alda started a competition of some sorts for people to explain what fire is to eleven year olds. The basis for starting this is that, when he was eleven, he was interested in fire, asked his science teacher what it was, and all that...

I only wish I could spell like this little girl who whats wants to be an astrobiologist. http://abcnews.go.com/WNT/video/national-spelling-bees-youngest-contestant-15941130 Don't ban me mircomass. She gives her definition of Philosophy. :biggrin:

mobile.news.com.au/breaking-news/world/german-teen-shouryya-ray-solves-300-year-old-mathematical-riddle-posed-by-sir-isaac-Newton/story-e6frfkui-1226368490521...

Hey guys, Well, it's the end of the academic year. I just had my last biweekly geometry class yesterday. I hope I did well on the chapter test I took yesterday. Anyways, as the title suggests I'll be going into Algebra II next year. Based on my experience in geometry class, I can...

Quick question, adults often ask me what I want to do when I grow up, and then seem a bit dissapointed when I say I don't know. Should a 12 year old boy have an idea about what he wants to do with his life? What I don't tell people, is that I kinda want to be an engineer. What do you think about...

Please can anyone tell me how can I find the Serial No. & Year of Manufacture of my 2.70 gigahertz AMD Athlon 64 X2 Dual Core Processor 5200+ ? Is it written on the CPU ? Or is there any Software which will tell me this information ? Or will the AMD Website tell this to me ? I want to know the...

I will be starting my first year as a phd physics student in the fall. I'm trying to get everything I need to start my first year of grad school. The one thing I'm not sure of is whether I should get a laptop or a desktop for graduate school. I am going into theorectical amo. Also I plan to...

Just finishing my first year of Physics, what topics are most likely to be in year 2 of a usual 'Maths for Physics' module if I wanted to start studying the Maths now? And what do you think would be the most useful topics to become quite fluent with?

Hello, thank you for taking a look at this thread. Here is my dilemma, I can chose 30 credits from various math and physics courses (each worth 10) for my second year, but I've decided to do maths as the rest of my modules are all physics but there are so many I have no idea what maths modules...

Just wondering if anyone can recommend a good linear algebra book for a second year course. In my first semester I learned up to Gram Schmidt process..EigenValues/Vectors etc. I don't care too much about how "easy" the book is to read. A book heavy in theory will do nicely if that's what you...

I am a first year community college student. I plan on transferring to North Carolin A&T State University, and majoring in mechanical engineering. I am having trouble getting any meaningful advice. If anyone can offer any advice it would be greatly appreciated.

hello all, I'm a physics major who's finishing up my second year as a physics major. I'm finishing up the 3 introductory physics course sequence and also the 4-semesters of calculus courses. In my community college, I was able to rank 1st on my physics courses and in the top 5 of my math...

Homework Statement The question states that a 3 stage amplifier needs to be designed with a 2W rms to an 8ohm load. the amplifier must consist of a pre amp stage and a power stage. (using only bjt's) Homework Equations Up till now we have learned about small signal model, DC biasing, ac...

1. The first problem statement, all variables and given/known data A crane rated at 2.5x105 W can lift a load of 1.5x104 kg vertically with a speed of 1.6 m/s. Determine the efficiency of the crane. Express your answer as a percentage. Homework Equations p=mv...

Hi everyone, I've recently accepted an offer to study astrophysics at Hertfordshire starting this September, obviously I'm excited, but after working for a few years in I.T then going back to college this year and starting university next year when I'll be nearly 22, I'm also in need of advice...

Hello guys, I am currently in my first year of studying maths and well... I thought I enjoyed it in the first term... but I really don't see the point of learning it anymore. I want to help other people and I am not sure how I am going to do this with a Math degree. I don't have any...

Obama-"...this is my last election year" http://abcnews.go.com/blogs/politics/2012/03/president-obama-asks-medvedev-for-space-on-missile-defense-after-my-election-i-have-more-flexibility/ How much will this hurt Obama's chances of reelection?

I'm pretty confused at the moment. I am doing great in my first year of calc-based physics, and when I read the text (I finished it before I even took the course lol), it was hard, but I plowed my way through and in the end looking back I thoroughly enjoyed it. That's also why I'm probably...

Hello everyone! I am having a bit of an anxiety stricken moment and would really love some advice. I apologize in advance if I type a bit lengthy, as I am quite expressive in real life... I am currently an undergrad student at a local community college in my city. I received my...

This does not make me particularly happy. http://arstechnica.com/tech-policy/news/2012/03/riaa-and-isps-to-police-your-traffic-starting-july-12.ars What do you people think?