Homework Help

I'm trying to solve a rather complicated question I was faced with using Lagrangians (this isn't homework, it's a challenge I want to solve, I just figured this is the best forum for that type of question). In order to do that, I've simplified the physical situation to show a flat ring being pulled (from the center, for simplicity) on a track shaped as a negative parabola. The ring itself represents a part of a spring, so the pulling force is relative to the spring constant. I've simplified it a bit for starters, see the following schematics: m would be the mass of the ring. The ball at the far end represents whatever mass is pulling on the ring and crea…

I`m having a problem... I`m a great essay writer when it comes to fabricating things or making it really connecting but research papers are not my thing. Just a disclaimer I`m nor looking for someone to write an essay for me, I`m simply looking for some possible sources that can help me. My topic is extraterrestrial life, it`s very broad at the moment, but I`m sure I can condense it down. My main focus is other galaxies with possible life and The Arecibo Message/reply. I know i probably sound really dumb right now, but I admit, I procrastinated [which happens more than i`d like to confess]. Any help whatsoever would be amazing, [especially since I have to …

A car travelling with a constant speed of 80 km/h passes a stationary motorcyle policeman. The policeman sets off in pursuit, accelerating to 80 km/h in 10.0 s and reaching a constant speed of 100km/h after a further 5.0 s. At what time will the policeman catch up with the car? Any help for the above problem will be appreciated!

Hey, Basically, as the topic title says. I need help with what the risks would be with using embryonic stem cells to help treat parkinson's? Thanks /Krazy

Hello, I decided that i would do something involving the homo polar engine for my science fair project. I have been trying to think of a variable i can change for it but all the ones i have come up with just wont work. Some of them are: •Battery size (wont work it only works on 1.5v batteries as i read somewhere) •Types of batteries (would be to expensive to test 7 times on each battery) •Do the 5 speed homo polar engine and record the amount of revolutions it does a minute. I have had others but have forgotten them. Ive ran out of ideas, so Ive turned to the brains of this science forum. Please if someone has a good variable that i can test well, graph and doe…

How does the average kinetic energies per molecule compare in a mixture of hydrogen and nitrogen gases at the same temperature? Really, I have read this stupid textbook 6 times. No explanation of this question no where. Please help!!!!

Hey everyone!, I would like some help on finding some memory tests on the internet that you know of that i could print out as i am doing an experiment for a Science Talent Competition that i would require some memory test that i could use for my testing. Also, if possible could you help me by giving me some ideas on how to make a good memory test? This would be well appreciated:cool:

1. What is the purpose of blending the plant/animal material with water and salt? 2. What is the rationale in adding liquid detergent to the mixture? 3. Why do you need to add meat tenderizer or pineapple juice? 4. Explain the formation of two layers as you add alcohol to the mixture. 5. What is found on the bottom layer of the alcohol-plant/animal mixture? How about in the top layer? Why? help me please D: thanks! put sources please

An object is situated 10m ahead of the reference point. It starts moving in the negative direction (towards the reference point) and then continues until it reaches a point 5m behind the reference point. What is the displacement of the object? Here's my answer. The displacement is the difference between the initial and final positions of the object. As the initial position was 10m ahead of the reference point and the final position was 5m behind the reference point the total displacement would be 15m. However everyone else I ask (Except my teacher.. I haven't asked him yet) says that the displacement is 5 because it is only 5m behind the reference point.. Which …

ok this is the question i need help with....it may seem pretty easy but i just plain suck at maths...thanks for any help Robbie is planning a trip overseas and knows that he will need $15,000 to pay for the holiday. a) Robbie can earn 8.05% p.a. calculated monthly How much does he need to invest now if he wants to be able to pay for his holiday in 1 1/2 years time?? b) How much does he need to invest if he can earn only 4.25% p.a. interest calculated monthly?

Please respond in less than one hour.

What are the pros and cons of stem cell research? I am supposed to form an argument about it tomorrow for an oral presentation for English. I am supposed to convince my class that I am right by using many persuasive techniques (e.g. bias). The oral is supposed to be 5 minutes long. What are the ethical issues of stem cell research? Thanks

This is almost an outright plea for spoonfeeding, albeit not before 8 hours of study hasn't produced much of a clue!! Here's the question: "Using various inbred strains of mice, design an experiment to determine the importance of the three classes of MHC antigens in graft rejection. Include results and interpretation of the results in your answer" I've got a good grip on the 3 types of MHC antigens and their relative importance in rejection. Cl II being most implicated (HLA-DR) followed by Cl I (HLA-B>A>C) and trailed by Cl III which I probably need to tie involvement of complement to and the fact that Cl III is usually expressed on endothelial cells. My …

An electrical cable contains three wires: live, neutral and earth. The cable is correctly wired to a plug which contains a 3 A fuse. The insulation becomes damaged and bare metal wires show. Five possible events can occur. A person touches the earth wire. A person touches the neutral wire. A person touches the live wire. The live wire touches the neutral wire. The live wire touches the earth wire. How many of these five events cause the fuse in the plug to blow? A. 1 B. 2 C. 3 D. 4

I'm gonna have this question on a test. I wrote out the glycolysis part just there can anyone tell me if its a good explanation or not Cellular respiration is the set of metabolic pathways in which the cell produces ATP from the breakdown of glucose. Cellular respiration is composed of 3 main parts. 1.)Glycolysis 2.)Krebs Cycle 3.)Electron Transport Chain GLYCOLYSIS: The first step in cellular respiration is the breakdown of glucose. This process is called glycolysis. Glycolysis takes place in the cytoplasm. Glycolysis itself consists of 10 metabolic reactions but these reactions can be categorized into 2 stages. 1.)Energy Investment Stage 2.)Energy Yieldi…

Abe the scientist uses pHydrion paper to test an unknown solution.The color of the indicator when it is dipped in the solution is a shade of blue that corresponds with a value of 10 on the scale shown on the package. Discuss the following, using sentences and showing calculations as needed. Is this an acid or a base, and why? Find the concentration of the Hdrogen ion and Hydroxide ion. Determine pH and pOH. Name 3 indicators which can be used to find the pH of various liquids

I have 3ul of a sample of cyctochrome in 497ul buffer with a pathlength of 1cm. Its peak in visible spectra is 530nm at 0.0103 absorbance. The molecular mass of cytochrome is 58 kda and the molar absorption coefficient for the reduced form is 30,900 mol-1 cm-1. Calculate the concentration in mgml-1 of cytochrome So far I have used Beer's law to find the concentration 3.333M but I am a bit confused as to what to do next? Thanks

So for our school project we are supposed to build a mouse trap vehicle which starts at a platform approximately a meter-1.5 meter off the ground and go as far as it can (in terms of x axis) without hitting the ground. The only power allowed is the mouse trap spring. So far my idea is to build a mouse trap car which releases mass amounts energy at first therefore containing lots of potential energy. When it launches off the platform, it will have hang glider wings which allow it to "glide" down as far as it can before hitting the ground. The only problem I have is what material the hang glider should be made out of. I'm thinking balsa wood but i don't know if …

This isn't exactly homework, but I am looking for good sites that describe specific results (preferably negative) of patenting genes among the lives of everyday people. I've already done quite a bit of research, and at this point I'm looking for personal cases that can help me make a more emotion based argument. I'm looking for cases similar to the Genae Gerard case, perhaps to do with the patenting of GMOs. Thanks for any help!

The formula that represents a protein is compound A. C18H32O2 B. C58H114PNO8 C. C600H1000O500 D. C708H1130N180O224S4 The answer is D. Please explain why B is not a good answer.

By using hot acidified potassium manganate (VII), is one of the products of the strong oxidation of hex-3-en-1-ol (leaf alcohol) this compound? Is it a diol or acid or both? What is the IUPAC name?

Question Amongst the radioactive elements that were incorporated when the earth was formed were: uranium 238U with a half-life of 4.5 × 10^9 y uranium 235U with a half-life of 7.1 × 10^8y thorium 230Th with a half-life of 8.0 × 10^4 y iron 60Fe with a half-life of 1.5 × 10^6 y manganese 53Mn with a half-life of 3.6 × 10^6 y thorium 232Th with a half-life of 13.9 × 10^9 y or 1.39 x 10^10 Given that the earth is believed to have formed 4600 Ma ago, which of the above could still be contributing to the radioactive heating of it's interior? Answer In that case 4600 Ma = 4.6 x 10^9 y Start by calculating the ratio of what is le…

hey everyone, I am doing QM, trying to solve as much problems there are to get a strong hold of the idea. here one question which i cant understand, i think that there is not enough information to solve this one; Assuming that a chemical bond can be modelled as a one-dimensional box,estimate the order of magnitude of the de Broglie wavelength of an electron in a typical chemical bond. do you think we have enough information in the question to solve this. The de broglie wavelength can be calculated using [math] lambda = \frac {h}{p} [/math] where p is momentum. how do you calculate momentum? I dont get it. Could anyone help. thanks!.

Hi all, Can anyone here please help me understand how to convert weight into pressure? I have two mats filled with air both connected to indecent air pressure sensors. One mat has a surface area of 12”x 12” and the other mat has a surface of 24” x 24”. I won’t to apply a small AA battery which has a weight of 10grams to both mats. Even though one mat has a bigger surface area than the other, would the pressure exerted by the 10 gram weight me the same? Please see picture to help understand where I am coming from: http://i719.photobucket.com/albums/ww191/avoinvents/weighttopressure.jpg Thank you all in advance.

Ok need help with a couple of questions; I am doing past papers and there is this question which I have attempted on my own but am not sure if I did right. A sample of hydrogen gas is held in a pressurised reaction vessel at 350 K and 2 bar claculate ; (i). the mean speed c(bar) (ii). the collision frequency z It also has given the sigma(H2) =0.27 nm^2 (i) I used the mean speed formula (8RT/pi*M)^1/2 to get 1924.83 m/s. The only thing I am not sure about is if I can use this formula(the confusing thing for me is the pressure of 2 bar, not standard pressure). I can calculate z, once i know that i calculated the mean speed right. Can anyone tell me i…