Homework Help

1. A discharged lithium-ion battery is constructed using a thin slice of graphite as anode, a piece of porous polypropylene sheet as separator, and a thin piece of lithium cobalt oxide as cathode. The dimensions of the anode, separator, and cathode are 1 cm x 2 cm x 50 microns, 1 cm x 2 cm x 25 microns, and 1 cm x 2 cm x 50 microns, respectively. When charging the battery, lithium ions deintercalate from the cathode and intercalate into the anode. Once the battery is fully charged, the anode has expanded by 10% in volume, and the cathode has expanded by 20% in volume. Assuming the overall volume of the battery is held constant, calculate the percentage in volu…

Earth is the place for people to live , through thousands of years of history, the earth began to disasters such as earthquakes , floods , etc. , we have lost their homes, we can do is build from their homes . Activities of the board is a kind of light steel skeleton to sandwich panels for the building envelope materials , standard modulus series spatial combinations members with bolts , a new concept of environmentally friendly economic activities of the board houses. Can be quickly and easily assembled and disassembled , to achieve a common standardized temporary buildings , and establish a green energy , fast and efficient building concepts, so that temporary housing i…

Hi, I need answers to some random questions on an experiment about triparental conjugation - it's hard to find explanations which don't require university education. I'd like to know how the replication of the plasmid works when it is transferred (i know about the rolling-circle-replication and the basic principle, but i couldn't find much about the function of the nic/bom-site and the mobilisation protein) I also need a little more information about the transposition of genes (again, I know the basics) How can Pseudomonas aeruginosa survive without sugar (meaning, how exactly does the metabolising of amino acids work? which ones can it metabolise?) If a fert…

Hi gang, I have a Master-slave D flip-flop with Clear and Preset in front of me. I'm a little confused on the output (which is Q and ~Q). If I understand this correctly, when the clock is coming down, negative edge, the input D matters and Q changes. Assuming Q starts at 0, If the clk is 0 and D is 1, that means Q is always 0 unless clk changes to 1... then Q changes to 1 ONLY if clk changes to 0 again and D remains 1? Then following this example D changes to 0, unless clk goes into a negative edge it wont change Q? My next question is the clear and preset, do these override clk and D? From what I read a positive edge flip flop will change the output Q i…

Hello! I'm new here and I'm gonna ask some chemistry questions and I would really appreciate if you'll teach or guide me on how to solve or figure out these problems: 1. A solution is prepared by mixing 50.0 g of glucose with 600.0 g of water. What is the vapor pressure of this solution at 25°C? 2. A solution is made by mixing 50.0 g of acetone and 50.0 g of methanol. What is the vapor pressure of the solution at 25°C? What is the composition of the vapor expressed as a mole fraction? Assume ideal solution and gas behavior. 3. In a coffee-cup calorimeter, 100.0 mL of 1.0M NaOH and 100.0 mL. HCl are mixed. Both solutions were originally at 24.6°C. After the rea…

This is from an online [EdX] introductory class in "climate science" ...of course: So tau = 55, and E = 0, from the information given, I assume. Seems to me, that if dC/dt is the ratio, and the concentration falls by 4/5ths, then the decay time (t) [...the "solution"] would equal or 'fall by' that same 4/5 ratio ... when applied to tau. === ...and then adjusted for the baseline year, to find the answer to their question, right? === It seems straightforward enough, and my 'solution' seems "realistic;" but my online 'answer' gets a red X, instead of the green checkmark. What am I missing in the math, or misreading about the question, above her…

1. Under normal operating conditions 1.5% of the transistors produced in a factory are defective. An inspector takes a random sample of forty transistors and finds that two are defective. a. What is the probability that exactly two transistors will be defective from a random sample of forty under normal operating conditions? b. What is the probability that more than two transistors will be defective from a random sample of forty if conditions are normal? 2. A control system is set up so that when production conditions are normal, only 6% of items from the production line gives readings beyond a particular limit. If more tha two of six successive items are beyond the…

1. The problem statement, all variables and given/known data If one light beam is heading toward you from the right, and another is heading toward you from the left, how quickly from the perspective of the right-moving beam is the left-moving beam approaching it? 1) 0 2) c 3) 1.5c 4) 2c 2. Relevant equations (v+w) / (1 + cw/c2) 3. The attempt at a solution I tried plugging in c into the equation for both v and w but it gives me (c + c) / (1 + c2/c2) which equals 2c. It is one of the possible answers but I know nothing can go faster than c so I'm thinking the answer is probably c. Am I right? If so, why? If not, what am I doing wrong? Thank you v…

Hello On a maths test, I got the following question: The game mastermind starts with forming a secret code, formed by placing 4 coloured pins in a specific order. The pins are being chosen from 6 different colours. How many codes are possible if a specific colour can't be repeated more than 2 times and open places aren't allowed? My answer: [math]N=\bar{V}^2_6\cdot\bar{V}^2_5=900[/math] I got 0/4 for this answer. Now I see it, I'd say I had to multiply it by 6 (the possibilities 2 pins can be placed), which would give 5 400 possibilities My teacher's answer: [math]N=V^4_6+C^2_6\cdot\bar{P}^{2,2}_4+C^2_6\cdot C^1_4\cdot C^1_2\cdot \bar{P}^2_4 = 2 61…

Don't really need help, already know how to do what I need to do..Was just wondering if anyone knew off the top of their head the average case time complexity of Linear Search Binary Search Selection Sort To find these would I just divide by 2? I only have found two so far. Bubble sort = n(n+1) / 2 and Insertion sort = n(n-1)/2 (I think)

A processor has 32 bit word instructions.

need help with linear eqautions such as 3 x - 19 = - 13 my teacher goes through things way to quick no matter how many times you ask him to slow down

What is the oxidation state of the polyatomic ion in the compound Mg(NO3)2 A. +2 B -2 C -1 D +5 E +6 The polyatomic ion is NO3, and I already knew the oxidation state of that nitrate is -1, so I thought the answer was actually +5. How is the oxidation state even a positive number and how is it +5 because NO3 is an anion, so it should be negative anyway.

Hi, This is my first post but I have been reading a lot of the posts and discussions for a while and I get a lot out of this forum, however, now I need help Brief details of assignment: The task is to produce a research grant application (honours level) with pre-specified manipulations, mine including guinea pigs as the animal and exposure to infection as the manip. This is what I have so far as my aims: The objective of the study is to assess the preventative benefit of a single pre-infection dose of TSLP in guinea pigs against the pathogenicity and virulence of the H5N1 strain of Avian flu. a) Further investigate the effects that t…

The volume of a sample of oxygen is 300 mL when the pressure is 1 atm and the temperature is 27 C. At what Celsius temperature is the volume 1 L and the pressure .500 atm? a. 22 C b. 45 C c. .5 K d. 227 C I used the combined gas law and set up the proportion of PV/T (1 x 300 m)/27 = (.5 x 1000 m)/x I solved for x (the temperature) and got 45, but the answer is 227. What did I do wrong?

The molar heat of vaporization for a certain compound is 30.8 kJ/mol. If 0.770 kJ were required to vaporize 1.95 g of the compound, its molecular formula could be a. C3H6 b. C4H10 c. C5H10 d. C6H6 e. C7H14 I tried using the formula q = Hvap x (mass/molar mass) and plugged in the numbers so .770 kJ = 30.8 kJ/mol x 1.95 g/molar mass Solving for the molar mass, I got .0128. What should I do after that?

Hello everyone. I don't want the answer to this question, only for someone to help point me in the right direction. The question is as follows: Suppose that f is differentiable on I:= (-inf,1), such that f(x) > 0 and f'(x) = f(x)^2 for all x belonging to I. Find f knowing that f(0) = 1. Thanks for the hints and help in advance.

Honestly speaking, I'm not sure if this post is in the right place. I'm actually asking help for a reporting of mine, not for a homework. So, if I'm ever in the wrong place, I'm terribly sorry. Feel free to move this thread elsewhere if that's the case. And please don't kill me, Mods. My report is on, as you might have seen from the tittle, about Tissue or Organ Engineering. I've research quite a bit on the topic and have already understood the basics, or at least I think I do. Basically, you create a protein scaffolding (or get one from a dead organism) of the tissue/organ you want to create, seed the cell in this scaffolding until it forms the tissue/organ then impl…

Theoretical mass percent of oxygen = (mass of 3 oxygen atoms)/(Mass of KClO3) Mass of ( K =39.10 Cl =35.45 O=16.00 ) So (mass of 3 oxygen atoms= 48.00)/(Mass of KClO3= 122.55) 48.00/122.55 = .3916x100=39.16% Right?

Hi everyone, I need to make a simulation (animation) of a transmission line with characteristic impedance of 50 ohm, finished in a complex charge and iniciated with a generator also in complex charge and obtain the standing wave pattern. I already make a code of this animation, but it's only for finished real charge and real generator charge. The problem is: ¿how do I make it also with complex charges? I put the ZIP achieve with the program that I already done. I think its a very complex code, but if anyone could help me only to obtain the stainding wave pattern I´ll be grateful. Final Proyect.zip

I am asked to comment on this statement from an economic perspective. "Over the last several months swarms of locust have destroyed 80% of almond plantations, thus dramatically decreasing the supply of almonds in the near future. This means that for the next several years we will observe shortages not only of almonds, but of other nuts as well." My answer is that this statement is false. When almond plantations are destroyed, the supply will shift and drive the price up. The market will eventually reach equilibrium as people substitute the almonds for other kinds of nuts which result in a decrease in quantity demanded for almonds. This will happen until the mar…

Hi, I think this is the right place for this question. I'm self studying entry level Physics, Chemistry and Biology which is ticking along at a steady pace. What I'm finding is that there is a lot of cross over of the subjects, particularly Chemistry and Biology. As a result I've been considering sitting down and attempting to pull all of it together into some kind of essay paper around my understanding of cells, enzymes and general catalysts, respiration and my understanding of reactions and changes of state etc. My spare time is pretty limited what with a full time job and young family so to do this properly would probably take a fair while, during which I …

1)A^2-B^2 WE CAN WRITE THIS AS (A+B)(A-B) but if A,B are two floating point numbers these calculations may yield different results why this under what circumstances does a difference between two calculators arise 2)why it's hard to ( time and hardware complexity )to add two floating point numbers than integer numbers 3) is my examples right or wrong integers = 25 ,-14, 11bin, A7Hex,17oct floating points 12.14 -7.33 -11.11bin 74.12 oct

A man tosses object with initial velocity of 20 m/s into a room, and is 2.0 m above the ground. The room is 10.0 m above the ground. In a provided diagram, the distance from man to room horizontally is 31.8 m. I am required to solve for the angle of the object as it leaves the mans hand. vix= 20cosθ viy= 20sinθ To solve for θ, I must use the initial velocity given, broken up into components. Since I am given the vertical displacement (8.0 m) and horizontal displacement (31.8 m) , I can use 2 formulas and substitute one into the other, by isolating t as it is common to both. dx= vixt 31.8 = 20cosθt t= 31.8 / 20cosθ dy= viyt + 0.5ayt…

Hi all, I have a question which I'm currently quite confused on. To begin, a saturation binding assay on intact wild type AtnR cells using the tritiated AtnR angatonist [3H]DPPX has been performed. [3H]DPPX is added to cells in increasing concentrations in the presence or absence of cold competitor DPPX to determine the non-specific binding (NS) and total binding (TB), respectively. Each tube contains 15 cells in a final volume of 500µL. DPM (disintegrations per minute) results are obtained for each concentration. From this, I must calculate the specific binding for each concentration. To calculate the specific binding I'll first have to calculate the non-sp…