Homework Help

Hey all, here is a problem that I have for homework and I can't figure it out. Any help will be appreciated. a 1650kg car accelerates from 15.9m/s to 28.1m/s in 8.31s. a.) what is the work done on the car? b.)what is the average power umed during acceleration? c.)what is the average force accelerating the car? So I know I have to use... Work = change in kinetic energy = 1/2 (m)v^2. Then what? Thanks ahead of time!

hi there... my sister was given an assignment that has caused all sorts of problems in my household. her assignment was to have a brush that if not used by the owner the brush gives off little electric shocks. i was thinking static electricity, but how do i charge it and have no clue where to start. http://www.scienceforums.net/forum/images/smilies/doh.gif so to all the brilliant minds out there help me please http://www.scienceforums.net/forum/images/smilies/redface.gif what i need to know is how can they give such assignments with so little time HELP ME PLEASE

The mass of AgNO3 dissolved in 300 g of water in a beaker and then heated to 50°C is: A) 152 g. B) 246 g. C) 455 g. D) 1365 g. How do you figure this out? Can anyone help or perhaps provide complete working out?

Which of the following alternatives contains only water soluble substances? A) Potassium chloride (KCl), and (SiO2), ammonia (NH3). B) Sodium nitrate (NaNO3), and glucose (C6H12O6), hydrogen chloride (HCl). C) Barium hydroxide (Ba(OH)2), salt (NaCl), ethane (C2H6). D) Iron (II) oxide (FeO), ethene (C2H4), ethanol (C2H5OH). I am confused! I do not know how to work this out...I don't think we have even covered this in class. How do you know what the answer is? Could somebody elaborate please on how you got the answer?

Suppose a straight hair lined man whose parents had a widow's peak marries a widow's peak woman who father had a straight hair line a) What percentage of their children would you predict will have straight hair lines? b) what is the possible genotype of the woman's mother? c) what are the genotypes of the man's mother and father? 2. The trait for puple hair (P) is dominant over that for green hair (G), w hich in turn is dominant over that for orange hair (O) P>G>o. The trait is X linked. Avigdor, a male, who has green hair, marries Clarinda, who has purple hair, not knowing that Clarinda's mother's hair was a bright shade of orange. a) wha…

Help!! how many atp are produced in the krebs cycle???

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?

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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!