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Homework Help

For assistance with (but not answers to) homework problems.

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A simple reminder to all: this is the "Homework Help" forum, not the "Homework Answers" forum. We will not do your work for you, only point you in the right direction. Posts that do give the answers may be removed.

  1. Started by yma16,

    The book is Mathematical Model of Acute Inflammation and a Full Lung Model of Gas Exchange under Inflammatory Stress. The author is Angela Marie Reynolds. One can find it in google books or the paper on the web. My questions are about page 9 of the book. It listed a lot parameters that I try to understand. I list some of my questions below. 1 kpg is the growth rate of pathogen. P(t) is pathogen level. Should kpg=P'(t)? 2 knp=0.1/P-units/h, which is activation of resting phagocytes(Nr) by pathogen. Is knp=0.1/P(t)? 3 snr=0.08Nr-units/h. I could only find the formula for dNr/dt, which is on page 13. Do I need to solve the ODE system to code snr? …

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  2. Started by shailene,

    Hi, What are safety issues with the chemical CuSO4 and how we can prevent them, writing a lab! Thanks

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  3. Started by Johno100,

    Hi I`m looking for a species from the Diantree rainforest QLD to write a 1000 word essay on , the essay must be on intraspecific competition and the chosen species , I need to be able to find journals to quote giving numerous examples of how this species competes with its own type. Thanks in Advance.

  4. Started by HANSCHETI,

    thanks in advance based on the image if a funnel shape cola bottle of two liter is replace by water upside down position what will be the force on the liquid right under the water and on the side as extended please provide with detail formula if possilble.

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  5. Started by N2Microbes,

    Can somebody help me understand this? I understand class 1 and 2 MHC molecules I am getting confused when they are being named like K^b and IAa^b help please?

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  6. Help answer this because I am confused. Q1) What is the main issue in the video? Q2) What is the whole idea behind the video?

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  7. Started by Ppa,

    In evolution terms what came first?

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  8. Started by Unity+,

    The problem is asking the following: Determine if the following function is O(x^2). f(x) = 17x+11 I attempted the problem by doing the following: Since the highest degree is 1, the following function is valid. Now, let's set c = 17. 17x + 11 <= 17x^2 x + (11/17) <= x^2 Since x = 2 is the lowest natural number that makes the statement true, c = 17 and k = 2. Is this done right?

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  9. Started by jacoblee,

    I am a developer of link removed I am using ED-XRF for geochemical analysis for a geology dissertation. The ED-XRF provides a ppm reading for elements and a 2sigma error, for example 472 +- 5.11ppm Sr. An example calibration curve made for Sr comprising 37 standards has a linear regression of y=1.26x + 32.1 (R^2 0.9991), which I can easily apply to correct my unknown analyses. I need to plot my corrected readings with their error bars, so how is the 2sigma error associated with this unknown calibrated? Does this error value also simply get calibrated with the curve equation, or just the slope value, or is this error propagation far more complex? I have searched for a…

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  10. Started by rasen58,

    There are two equal masses of silver insulated from each other. Sample A is maintained at 20 degrees C. Sample B has twice as much thermal energy as Sample A. Silver has a specific heat of 233 J/g*C. What is the temperature of sample B? I don't have any idea how to do this and don't have that good of a grasp of the term 'thermal energy'. I think thermal energy is equivalent to total kinetic energy of all the particles, so maybe you could use the formulas for average kinetic energy, but I'm not sure how. q = cm dT KEavg = (1/2)mv2 = (3/2)KT

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  11. Started by rasen58,

    3 kg of ice whose temperature is -10 C is dropped into 10 kg of water whose temperature is 10 C. How much of the ice melts when the mixture is brought to equilibrium? I wanted to find the equilibrium temperature first so I used q = cm T And c (water) = 1 kcal/kg C, c (ice) = 0.5 kcal/kg C So (0.5)(3)(x - (-10)) = (1)(10)(10 - x) That turns into 1.5x + 15 = 100 - 10x x = 7.4 C So I then determined how much energy outputted when lowering the temperature of the water is q = cm T = (1)(10)(10 - 7.4) = 26 kcal Then, to bring the ice to 0 C requires q = cm T = (0.5)(3)(0 - (-10)) = 15 kcal Then, to cause the phase change, I found the latent heat. H…

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  12. I did an experiment where I dropped a coin in 3 liquids, Maple Syrup, Glycerol and Water. I timed the results and it seemed the coin went slowest in Maple Syrup and the Maple Syrup was the most dense solution. Is it because the coin's density is near the liquid's density, so the up-thrust force and the down-thrust force would be pushing however the resultant force was the down-thrust force? EDIT: Subject: Science Level: Grade 7, MYP.

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  13. Started by psyclones,

    Hi, Can you help with the following (please refer to attached). If I understand the problem, both magnetic fields B1 & B2 need to change direction, due to the change in current (I) by replacing the positive with a negative ion. Your thoughts, My apologies, but I can't appear to upload the attached file. I'll try again later!! Please find attached!

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  14. Started by b0red,

    You need to lift a 200 kg box 5 meters, but it is too heavy. You decide to push it up an incline that makes a 25o angle with the ground. With what force do you need to push the box? You can estimate your distance from a lightning storm by watching for a lightning flash and then counting in one-second intervals using the general rule that you are 1 km away for every 3 s you count. Explain why this rule works. Estimate the distance from a lightning storm if it takes 8 s (exactly) for the sound of the thunder to reach you after you see a flash of lightning. Assume that the temperature is 21oC. (The speed of light is approx. 2.99 x 108 m/s.)

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  15. Hi, I am doing a research project and need some help with the write up. Basically my project is about measuring Hepcidin levels in blood samples. I will be obtaining these from the hospital. I will most likely be measuring Hepcidin and other inflammatory markers by commercially available immunoassays however I don't know if I would need to do anything with the blood samples for measurement ? I mean if there is any preparation required of the blood samples beforehand ? and what techniques I would be using because I have never done anything like this before. any ideas would be appreciated

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  16. Explain what happens to your body in terms of inertia, friction, and forces when you slip and fall on an icy sidewalk i need it in a paragraph 5 sentence or more please

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  17. Me and a classmate have to make a thermos to hold boiling water for a certain amount of time and keep the temperature as close to the original as possible, but we need help coming up with materials.

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  18. So I'm having trouble with one of my questions for my hydrology assignment and I would appreciate it a lot if one of you could help me. Consider an aquifer contaminated with an aqueous phase and a sorbed phase. The organic carbon content (foc ) is 0.0025, the porosity is 40%, bulk density is 1.4 g/cm 3 , and log Koc is 2.2. For a unit volume of aquifer, calculate the percentage of mass in the solution (aqueous) phase and the percentage of the mass in the sorbed phase. How would i go about calculating the mass in the solution of the aqueous phase. I found the Kd by doing Koc=Kd/foc

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  19. I'm a medical student, helping out a friend in her research in Ozone and how it effects Embryos... where would I look for any available data on any related research... I already searched in google for few days now, but it seems like the only reaserch done so far is how well ozone acts as a disinfectant on eggs. pls help us out

  20. Started by whopperjrjumps,

    Question: Tums react in your stomach to produce a gas. The average adult stomach expand to one liter when full. Calculate the pressure in the average adult stomach after taking 2 Tums. I really have no idea where to start on this problem. I know that chemical formula for Tums is CaCO3 and that it reacts with hydrochloric acid in the stomach which is HCl. Since, this is a carbonate-acid reaction, carbon dioxide is the gas produced, correct? Also since I'm looking for pressure and I'm given volume should I use the equation PV=nRT? If so, what would the temperature be? If I don't seem to be headed in the right direction, please help out. Any suggestions would help. Thank…

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  21. A flask is closed tightly with a rubber stopper 3.00 cm in diameter. All the air in the flask is then removed. How much force is necessary to remove the stopper from the evacuated flask? (1 atm = 1.013 x 10^5 N/m^2) I have no idea how to do this problem. I think I'm supposed to use Bernoulli's equation, but I'm not sure how exactly to use it. I also tried using P = F/A So F = P*A = 1 x 10^5 x pi x (0.03)^2 = 283 But the answer is 71.6 N.

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  22. Started by psyclones,

    Hi, Can you assist with the following (refer to attachment). I've sketched out how I think the particles will behave, given a -2Q particle interacts with each of the +ve particles (in turn). But my problem is; if the particles of opposite charge are touching. The attractive force become infinite. F = k (q(1). q(2) )/ r^2 r --> 0, F --> inf. Do the particles move? the problem states that they're fixed(??) Your thoughts. Any assistance will me much appreciated. Just add to that. To calculate the applied charges, I'd have to use a field equ, F = E/q, where E is the electric field as a result of the other particles acting on +3Q, But how do I (or would you) for…

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  23. Started by g3popstar,

    Is it possible to show that coriander has antioxidant properties in a lively manner (eg.like using RBCS) apart from standard assays like comet assay etc.,

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  24. My teacher has given this question that nobody in the class seems to understand. Can anybody point me in the right direction? Q. You wish to know whether the cDNA you have isolated and sequenced is the product of a unique gene or is made by a gene that is a member of a family of related genes. To address this questions, you digest cell DNA with a restriction nuclease that cleaves the genomic DNA but not the cDNA, separate the fragments by gel electrophoresis, and visualize bands using radioactive cDNA as a probe. The Southern blot shows two bands, one of which hybridizes more strongly to the probe substance than the other. You interpret the stronger hybridizi…

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  25. Started by rasen58,

    When tripling the volume of a given weight of gas at 27 C, keeping the pressure constant, the temperature must be raised to? I used V1/T1 = V2/T2 and set V1 to 1 L 1/27 = 3/T2 T2 = 81 C. But the answer says it's 627 C. Is it wrong?

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