Homework Help

Hello all, I'm looking for insight with one of my solar engineering course problems, the answers are multiple choice. I'll post the problems and the relevant (unless I'm missing some pieces) equations below, as well as explain the logic of my thought process. This is a multiple choice problem, and I already solved for one of the available choices however I more or less am looking for some validation in the process... if I had to guess I'm missing something still. Here the assumption is that the incident power (P_in) under standard testing conditions is 1000W/m^2, and that J_sc = I_sc / area. From there I used the equation in the second picture and basically…

What's the thermodynamic meaning of these molar Gibbs free energy values? I know that when it is ΔG>0 , it means there is no spontaneity, when ΔG=0 there is equilibrium, and when ΔG<0, there is spontaneity. But what happens when G is molar?

In my first post I just want to confirm length contraction in special relativity at a later date I will post my entire summary of special relativity. It is a work in progress. I travel to a planet from earth it takes 5 years. Bob is located on earth. Alice is moving at v = .986c on a spaceship to the other planet. If I want to know the length for Bob in Bob's frame d= vt = (.986c)(5 years) = 4.93 LY If I want to know the length for Alice in Bob's frame. L = L'/ gamma = L' = (L) (gamma) = L' = (4.93)(5 years) = 29.58 LY If I want to switch velocity I use Einstein''s velocity addition formula and I get -.986c for planet earth and the other planet. My…

Once they are absorbed, by what mechanism do nutrients travel from the enterocytes into the blood?

Hi guys So I was set an assignment to find the amino acids in a dipeptide using results from Chromatography and the pKa values after titration which I found to be alanine and histidine. I was also asked to point out the ionisable chemical groups which I had no problem doing. The last question has me stumped though: "If you had a tripeptide containing glycine, how would this change your results?" I don't think glycine would add another ionisable group to the tripeptide so now I'm kind of stumped on what changes would happen if any? Would this change the results at all? Can anyone point me in the right direction, many thanks

Hi everyone! First of all I would like to thank whoever is reading this! Back to my homework, for genetics I have to choose the most suitable technique to detect a 1'5 kb deletion which affects an intron and an exon (not entirely). I thought about doing FISH but someone told me that the resolution is not suitable for this deletion and, to be honest, I'm completely lost. I thought about doing MLPA or array CGH, but I'm not confident at all. If someone could help me find the best technique I would be extremely grateful, as I've spent 3 days thinking and doing research about it and I'm still lost. PD. Sorry for my poor English! Hope I made myself clear! P…

The question says "write the formula for calculating velocity of enzymatic reactions. From this formula, calculate the velocity of a reaction with concentration of the substrate equal to 0.5 Km" Im totally stuck. I know the formula is Vo = Vmax (S)/Km + (S) but I cant solve it any further

Hi, I am looking to figure out Mg/Ml so I have ingredient “a” it’s in powder form and I want to make a solution of 1.5mg/ml and I want to make 250ml in total so just to confirm I have my numbers correct I add 0.0015mg per 1ml of solution so to make 250ml I add 0.375g / 375mg and adjust the solution to make a volume of 250ml I am sure I have my numbers correct now I am looking at it wrote down here but it just did not look right on my calculator. thanks in advance

Hi all just a little help/clarification required. I am measuring how the launch angle affects the accuracy of the projectile. In the image that I have attached it demonstrates that for angles up to 45 accuracy decreases and will increase again from 45 to 75 degrees above the horizontal. However for the next part I used the equation below to calculate the range for accounting for air resistance. Those results are attached below. However this is not in conjunction with my other results. In the second part from the data I got that as time of flight increases the accuracy decreases when accounting for air resistance. However this is different to the first screenshot. Can I g…

The problem asks to find dy/dx in y=sinh(x+y)/xy=1. What I do is: differentiate both sides using implicit differentiation which gives d/dx(sinh(x+y)/xy)=0. I differentiate this setting y' where I have to differentiate y with respect to x. Thus I get (xycosh(x+y)+xyy'cosh(x+y)-ysinh(x+y)-xy'sinh(x+y))/(xy)^2. Then I solve for y' and I get y'=(-xycosh(x+y)+ysinh(x+y))/(xycosh(x+y)-xsinh(x+y)). But the answer in the book says y'=(y-cosh(x+y))/(cosh(x+y)-x). What am I doing wrong? Is my procedure incorrect? Thank you.

I am unsure how to do this question: You are using olive oil as oil phase (HLB: 8.6). Span 20 (HLB:8.6) and Tween 20 (HLB:16.7) as emulsifying agents. Total amount of emulsifier mixture is 3.5g. Using HLB system equation, calculate amount of each emulsifier

https://en.wikipedia.org/wiki/Lorentz_factor Just scroll a tiny bit to find what I am referring to.

x^2 +1 +1/k if I move the k to the right hand of the = sign first it can't be zero because k/0. x^2 +1 +1/k if I move the +1 to the right hand of the = sign first it can't be 1 because that would make 0. So what is it 0 or 1? I probably just made a simple math mistake I apologize if this is a stupid question.

Hi, My advisor told me to look into and work out a fitting research design for my Master Thesis. I'm writing this about the effect of the corona pandemic on the sale of phishing tools on the dark web. I'm going to analyze data from before the Corona-pandemic (to understand before the situation before the pandemic) and data after the initial beginning of the Corona-pandemic. Can anyone give me any advice on a fitting research design? I was thinking about a retrospective study, however I don't think that is that common in these type of studies. Or the emperical cycle? Thanks!

Consider the situation where we want to combine the space-time diagrams of Alice and Bob, where Bob is moving at a speed of 0.4c to the right (positive x direction). If we draw Alice’s x_A axis as horizontal and t_A axis as vertical, answer the following questions.(a) What is the equation, written in terms of x_A and t_A, that describes Bob's t_B axis (the world line where x_B = 0) on Alice’s diagram? a) What is the equation, written in terms of x_A and t_A, that describes Bob’s t_B axis (the world line where x_B = 0) on Alice’s diagram? I assume I want to change from Bob's frame to Alice's frame. Is this correct. here are the releva…

By L' I just mean L prime. I may have worded the title badly. Does the Lv/c^2 = L' ? Or can Lv/c^2 = L?

I guess its some kind of Antibiotics but I dont really hace a clue Thanks for any reply

Hello i just start my fist semester as a philosophy major, I’m most familiar with Eastern philosophy and know very little about Kant, this is a very small assignment and i don’t want to have to scroll through a 200 page document about the roots of his beliefs or a read a book for that matter this is just a starting class. So could someone link a reputable website rather can help me understand this topic (wekipidia isn’t allowed for some reason)?

When I was learning about the twin paradox I learned that in Bob's frame the space time diagram is represented by the diagram on the far right. In Alice's frame the diagrams are represented by the far left and middle diagrams. Doesn't this assume acceleration because there are 2 frames. How do I solve if there are no acceleration? https://imgur.com/a/mEaDPcP

I have been trying to the Bell's Spaceship Paradox but I am getting confused. Can someone simply explain the solution to the paradox according to special relativity? https://en.m.wikipedia.org/wiki/Bell's_spaceship_paradox This is what I think I understand but I am not sure. This could be wrong. The ships starts off the same speed 0v. Then the ships accelerate. Due to the Lorentz transform the ships distance gets longer. The rope also stretches. How does this lead to the rope breaking? In the ships frame I see the ship the same length. I just see a person running. How do I reconcile the 2 frames? Here is a good space-time diag…

Hi everyone I'll keep this short and simple, for the formula for the first law of thermodynamics how come the formula can be either negative or positive? E.G ΔU= Q + W/ ΔU = Q - W

20201007151103cv_hw_2.docx

What is the best entry level book for your field/fields of expertise? Self directed homework. Feel free to add a personal book list in the order you'd read them in. No textbooks please. Unless that is stylistic of an individual relevant and important author. Thanks so much in advance!

The problem says: It takes 300,000 years for a certain radioactive substance to decay to 30% of its original amount. What is its half-life? The result is 173,000 years, but I don't see how it is obtained. I tried solving for x in f(x)=300,000e^(300,000×x)=0.3, which is approximately x=0.00004. Then I solved for x in f(x)=e^(-0.00004×x)=1/2, which is approximately x=173286. That's the closest I got to the actual result. What am I doing wrong? How do I obtain 173,000? Or maybe my answer is correct and 173,000 it's just an approximation? Thanks.