Homework Help

Hello, I'm writing my thesis and i was wondering the following; Do suspended particles in a solution conduct electricity? I see a decrease in conductivity after separating suspended solids in a solution (starch and fibers in a potato fruit juice solution). It's 10-20% reduction in conductivity. I'm wondering if this is a result of the separating of the solids or if there is another reason. Thanks in advance.

What is the formula to read pressure from Recknagel manometer? And what is the formula for pressure in Pitot tube? (I have flow rate, density, slope of the manometric fluid in the Recknagel manometer)

Can someone walk me through in detail what happens when an atom is ionized by colliding with an electron? I would prefer a solid example so I can understand it more concretely. What I think: The electron collides with the atom giving it energy, but then goes away after that. This energy excites an electron inside the atom, which receives enough energy to leave the atom. The atom is ionized. However, I also thought of another way: The electron collides with the atom and gets bound up in the atom. The atom is now ionized (negative ion, since extra electron) Are any of these descr…

Hey all, I am doing a research assignment in Physics on whether swimming with a woollen swimsuit, swimming bare-chested, or swimming in an LZR Racer swimsuit makes results in faster swimming. I have found all of the theoretical information that I need, to do with the physics behind it, but I can't seem to find any journals or reports that talk on the difference swimsuit material makes on swimming speed, that is, that have done experiments and gained tangible data. I can do without it, but as my report would be better with it, I thought I'd check if anyone knew of any such reports, experiments etc that I could checkout on the subject. All I have right now is that the …

Hello everybody, Can someone help me with this task? "Name two processes in which the substrate is first formed with ATP to form one mixed anhydride of its carboxyl group and the α-phosphate of AMP activated must become". I'm very thankful for your help Greetings Yasmine

Hello All :) I am a student of mathematics, but I have only one semester of physics in college. I can't solve one with homework. Will there be anyone wise who can solve this? The task is as follows: Calculate: at what height the artificial satellite must move (orbit height): geostationary determine the first and second cosmic velocities

Hey all! I've been struggling with this question for almost a week now, and I seem to misunderstand some principles leading to a solution. I hope anyone could help out! Here it goes: Consider the following pedigree, showing a disease in humans. The DNA sequence causing the disease is known. A group of researchers has prepared a probe for the entire mutant DNA sequence, used to yield the following southern blot. Assume that the probe can identify all possible alleles for the mutant gene (A/B/C). Note that the thickness of the band is meaningless. A) Predict the hereditary mechanism for the following disease. B) Both parents have had two more children;…

I know this is simple but I would like to make sure I've used the right procedure to determine number of ions by knowing the total weight of mineral and % of an element of interest. I want to find number of atoms in one pound of pure potassium. So I took the molecular weight of potassium 38.963706 g/mol x 10+15 lb.-mol = 0 .003963706 kg/mol x 10+15 lb.-mol = 38,963,706,000,000 atoms in one pound of potassium. Thank you for your time!

Hi (sorry if my english isn't good) I have a task with which goes like this: A battery is based on oxidation of Magnesium and reduction of Copper-ions. The starting consentration of Mg2+-ions and Cu2+-ions are 1,0 * 10-4 M and 1,5 M. The volume of each halfcell is 1 liter. a ) Calculate the battery-voltage at the start. b) Calculate the battery-voltage after the battery has delivered 5,0 A for 8,0 hours. I think i got a) right. I just calculated the cellpotential and put it in Nernst forumla like this: Oxidation: Mg2+ + 2e- --> Mg(s) : -2.36V Reduction: 2Cu2+ + 2e- --> 2Cu : 0.16 V Cell potential: E …

The question is: How much gravitational potential energy is required to lift a 9270 kg Progress spacecraft to the altitude of the International Space Station, 424 km above the surface of the Earth? I had used the equation Ugpe= - (GMm)/r and got an answer of -8.71*10^15 J and it said it was wrong. I have no clue where I went wrong or where I could go next.

Here is the problem: Now, if the speed is constant, then shouldn't the answer be 30 feet per second no matter where the shark is?

Am I right in saying the compound in the attachment is named 3-bromo-2-chloro-5-ethyl-4,4-dimethyoctane? Thanks

I am a bit confused about a question in my textbook involving redox titrations. This is actually a sample problem that has been fully worked through in the book, so I am not trying to get its answer. However, I am confused about one particular step. Here is the question: A group of students prepares to standardize a Na2S2O3 solution. 32 mL of the Na2S2O3 solution is titrated into 50 mL of a 0.01 M KIO3 solution to reach the equivalence point. They first titrate the KIO3solution until it loses color, then add a starch indicator until the reaction is complete. The reaction proceeds in these two steps: IO3-+ I-+ H+ -----> I3-+ H2O I3-+ S2O32- -----> I…

Can anyone provide help with drawing an ERD for this scenario ITHelpDesk is an online system used by the IT Department at MYCompany to manage and track user’s issues and complaints regarding their usage of computing resources in MYCompany. You are to develop ITHelpDesk System to help them improve the performance of the current situation and overcome the problems that arise nowadays. The system uses a ticket system to manage the user’s IT issues and complaints. Each ticket will contain a title, body, system specification, priority and the employee to send it to. The employee will be added to the ticket and sends a response to the ticket. The user will receive the re…

6g of a contaminant is introduced instantaneously 5m along the cross section of a pipe that is 10m long and has a 1m2 cross sectional area. Water is being very slowly pumped through from one side and out the other at 5 x 10^-5 m/s and Dm = 3 x 10^-8 m2/s a.) At what time does the CENTER of the contaminant patch reach the end of the pipe? b.) What is the MAXIMUM CONCENTRATION at that time? c.) Where is the TRAILING EDGE (assuming the width of patch is 4sq(2Dmt) located after 5 x 10^5 s? Note: I primarily need help on part A, i can do the rest on my own but I'm so lost on how to figure out the time in part A.

Hopefully during this period of isolation for many of us, someone can find time to check this. Some introductory remarks, this is a maths subject not physics and they really don't care about units but they do care that you simplify the answer as an accurate expression before approximating with the calculator. I have struggled with the differentiation so would appreciate thoughts there. This is just the first part at this stage. QUESTION: The ideal gas law relates the temperature, pressure and volume of an ideal gas. For n moles of gas the pressure P, volume V, and temperature T are related by the equation: PV = nRT Where n is the ideal gas con…

I am trying to understand the following question: The molar solubility of Fe(OH)3 in an aqueous solution was determined to be 4 x 10^-10 M. What is the value of Ksp for Fe(OH)3 at STP? I understand that Ksp = [Fe3+] [OH-]3. I know that we are meant to look at the mole ratios of products to reactants, substituting x to get Ksp = (x)(3x)3. And I see that we are meant to then reason that x = 4 x 10^-10 M. However, this is where I get lost: I thought that the whole point of the Ksp was to convey the relative amount of product vs reactant we have at equilibrium/saturation. If we have a very high Ksp, for example, I thought that it meant that the equilibrium favored t…

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Hi, I have to do some statistic, and I don't understand how works the shapiro-wilk test or the barltett test. I think I understand why do we use it (to see if an sample follow a normal distribution for shapiro and see if our vaiance are equal for Bartlett). But I am completely unable to do the math, can somebody help me ? Thanks

Hiya, Is it possible to use sound waves or another means to take measurements from a plastic coated surface? For argument sake let's say we have 10 seemingly identical plastic coated sheets, by using sound waves or something else is it possible to take measurements from the surface which would allow you to differentiate between them from non visable differences brought about by variations in the coating and manufacturing process? Many thanks, this is a great site and all the helpful people on here. I am learning a lot.

The essence of the task is: Get 11 grams of calcium oxide from calcium chloride hexahydrate and calculate the practical result of the synthesis. Write the equations of chemical reactions! Calculate the mass of substances and the volume of water required for the preparation of solutions! How many searched, I can not understand what solutions to mix

Can some1 double check these 5 questions about phylogenetics and natural selection? I would love if you can double check all, but feel free to just jump in on which ever you feel good about! 15) Which of the following characters are neither (currently) adaptive or exaptive? The color of blood cells. The oxygen-binding properties of blood cells. The presence of lungs in some modern fishes. The waxy cuticle of cacti. The limblessness of snakes. Q16) Which is NOT one of the three conditions that must be met for evolution by natural selection to take place? Variation in phenotypic traits must exist in the population. Differences in phenotype influ…

I don’t even know where to start on this! Please can someone help me out on this! 😩😣

I teach junior high. Could someone clarify, would soaking paper towel in food coloring water be diffusion or osmosis or both? Explain which aspect is considered osmosis? Diffusion? I.e. celery stalk in food coloring water is osmosis, because water particles are travelling through semipermeable membrane. What about the solute (food coloring), travelling upwards along with water particles, area of high to low concentration. Would this be considered diffusion? How to distinguish the two.