Reduction Definition and 447 Threads

This is the final problem in this problem set from MIT OCW. Here is what I did to try to solve it The table cited in the problem is below We can easily spot the two redox couples that are in the electrochemical cell we are given. The hydrogen-based electrode has standard potential zero, and...

I am looking at ## \int \tan^n dx ## where ##n## is a positive integer. The index ##n## has been reduced by writing ##\tan^n x ## as ##\tan ^{n-2} \tan^2 x## which is quite clear with me. We have, ## \int \tan^n xdx = \int \tan^{n-2} x⋅ \tan^2 x dx=\int \tan^{n-2}x ⋅(\sec^2 x -1) dx ##...

I saw this video on YouTube, () which shows a person making potassium with the following reaction K2CO3 + Mg = K + C + MgO I just don’t understand how Mg can displace K I googled the reaction but couldn’t find much info on this reaction. Could someone give the name to this, or explain the...

I have no idea whether in V=IR, V can be standard reduction potential, and R is inverse electrical conduciveness of that metal. I plotted the reduction potentials and they are strongly inversely correlated with resistance. I'm more confused by this because I have no idea how much amperes "A" we...

I have a random but pressing question. I am currently being blasted a nearby ultrasonic noise machine which I can only get within 2 metres of and there is no one to appeal to regarding the issue. How can I disable/reduce the noise given the constraints? This is the device...

I have tried row reduction to solve for the first eigenvector but I don't feel like I get any closer to the solution:

SPOILERS This obviously wouldn't happen to that extent, not without tearing the planet to pieces as well. But might they feel a reduction in weight at all? Obviously it's a pretty hypothetical question without any specifics about the distances to the suns but in theory at least.

(i) I take the second derivative of Y: Y'' = 6X + 2A. Y'' = 0 when X = -A/3. Moreover, as Y'' is linear it changes sign at this X. Thus, it is the point of inflection. (iii) After the substitution, the term x^2 appears twice: one, from X^3 as -3(x^2)(A/3), and another from AX^2 as Ax^2. They...

Hello, Please see the attached sketch. A car hits a mass of soil and applies the impact force of F. The force/wave travels the distance L through the mass at the end of which there is a wall so I think the force attenuates. Assume we have all the properties of the mass. My question is, what...

Hi! Please, could you help me on how to solve the following matrix ? I need to replace the value 3 on the third line by 0, the first column need to remain zero and 1 for the third column. I'm having a lot of difficulties with this. How would you proceed ? Thank you for your time and help...

Hi everyone, I'm in a graduate level mechanical engineering thermodynamics class. We're working on derivative reductions using the gibbs and maxwell relations. I was wondering if anyone has any good sources of practice problems that I could use. I've looked through my textbook and there are...

Continue reading...

We studied in chemistry that the concept of oxidation and reduction is the exchange of electrons between two chemical substance ,but when i started to study organic chemistry i saw that when we talk about for example the oxidation of a compound it can loss atoms and change his constitution...

Hi, I'm trying to solve the number 5 and 6. Now I'm wondering what happens when I add H2/Pd/C on the 4th (after the question 4) molecule. I know that it will reduce pi bonds to sigma bonds, but will it affect the cetal group? Because if it does't I'm not quite sure that I'll be able to do the...

Hi, I am trying to solve number 8. At 7, I have a molecule that contains both an amide and ester function. So when I use LiAlH4, will I reduce both the ester to alcohol and the amide to secondary amine? Or just the ester? Thank you so much for your help!

Hello everyone !I am working on noise reduction and I wanted to do some experiments with an arduino. I took an arduino which get music (as an example) in input by jack. It also has a microphone and in a first try the goal is to get as an output the music - the noise around... To act like a kind...

Problem statement: Second order linear differential equation in standard from Reasoning:

Dear friends, I am simulating a capacitance multiplier circuit and an RC filter circuit simultaneously. My aim is to check the reduction in ripples when using a cap multiplier circuit against an RC filter. I am familiar with ltspice but not quite an expert. I am comparing two output waveforms...

Hello, Firstly I am not sure of understanding the problem, I believe that this reduction is related to a high density plasma where the free electrons are very close to the ions and so the ions cannot be considered as separate bodies... I also believe it affects the ground energy state of...

I hope to explore mechanical engineering one day so I can answer these kinds of questions on my own, but until then, I appeal to anyone that knows how to do this to help me. I am building a core xy 3D Printer and I want to use a belt driven Z axis. I will have 3 or 4 stepper motors to drive...

$\tiny{307.1.1}$ Use row reduction on the appropriate augmented matrix to solve the following system of equations: $\begin{array}{ll}3x+2y&=2\\x-y&=1\end{array} \sim\left[\begin{array}{rr|r}3&2&2\\ \:1&-1&1\end{array}\right]\sim \begin{bmatrix}1&0&\frac{4}{5}\\ 0&1&-\frac{1}{5}\end{bmatrix}$...

The question is: If the compression ratio of car engines is increased by 10% (from 10 to 11), estimate the volume reduction in annual CO2 emission. Assume there are 30 million cars each consuming one cubic meter of fuel annually. The question is looking for a rough estimate for an answer. I...

As I was looking in the caracteristics of an old tank, I found a number that I could not get anything of on the web. It is called "entire reduction ratio" and was presented just under the gearbox caracteristics. His value is 1:13.4. My question is : is it useful? Does this value have relation...

The answer key says the correct option should be a, but I think it should be b. Because Y has a reduction potential same as the element B. An element is a good reducing agent only if its reduction potential is negative or less positive.

The lining on my ear muffs which contact the ears, developed cracks and eventually split apart. I decided to try and repair the muffs, so they would have noise reducing qualties than those were better than any typical store bought muffs. Unfortunately, the finished product, reduced the outside...

Hello, looking to find out what the term "10000 units per 15 min (quick reduction)" from the WHO means in terms of using heat to kill a virus.

I have a customer looking for a 100KW isolated DC/DC converter. What is a realistic transformer core weight reduction if we get 1000Hz fundamental. Assume a 60Hz core is 300 Lbs, how much smaller could a 1kHz Core be?

In the world of Origin of Life hypothesizing, there now seem to be two main competing approaches. Life originating at alkaline hydrothermal vents and an origin in intermittent terrestrial pools (exposed to periods of drying) getting outflow from volcanically heated water sources. The alkaline...

mod note: not homework I have got a DFA. I can't understand the marking procedure used for DFA minimizationHi, I am not able to understand the marking step for DFA minization. Some body please guide me. I have uploaded the image. Zulfi.

Some numbers below: these are the standard molar enthalpies and entropies at 298K that I got from a website. In the reaction FeO + CO = Fe + CO2, the deltas are: delta H = (0+ -393) - (-266.5+ -110.5) = -16.3 KJ/mol. delta S = (27.2+213.8) - (197.9+54) = -10.9 J/mol/K Now at 1200 K, Go = -16.3 +...

When a body accelerates down(climbs down) a rope, why does its apparent weight reduce? Oh wait, does it even reduce in the first case? If yes, is it because of the Newtons first law of motion, which states that a body in motion tends to be in motion and a body at rest tends to be at rest. So...

I can solve the deflection if only cantilever beam by deflection formula, but i have no idea for this question if calculated with a cable support arrangement.

Above

Hi, I have some crucial questions belong to statistics: First, How can we derive the variance function with respect to mean for a given data? Secondly, I would like to ask: what method should we employ if the variance in time series behaves like a high order (such as ##𝑎𝑢_𝑡^5+𝑏𝑢_𝑡^4+𝑐𝑢_𝑡^3##...

When salt (polar) is added to water (polar) it makes the water more polar and causes the oxygen (non-polar) to be "driven" from solution. So I'm assuming this is an electrostatic repulsion(?). Aside from salt what other solutes would cause this to happen? Would a solute have to have very polar...

In the textbook “Principal Component Analysis” Jolliffe (§9.2) suggests the following method for variable reduction: “When the variables fall into well-defined clusters, there will be one high-variance PC and, except in the case of 'single-variable' clusters, one or more low-variance PCs...

I am trying to distinguish two different plant species based on their chemical signature using statistical signal classification. This is what the average curves of two species look like with their standard deviation bounds: These spectra are made up of ~1400 points. So it was suggested to...

Cl2(g) + 2I–(aq) -->I2(aq) + 2Cl–(aq) (reaction 1) [2S2O3^(2-)(aq) + I2(aq) --> S4O6(2-)(aq) + 2I–(aq) (reaction 2) Why isn't n(I2)(reaction 2)=2n(S2O3^(2-))(reaction 2). I don't see why this is wrong. <edit: remove size and italics>

Homework Statement If E°(Fe2+/Fe) is x1 and E°(Fe3+/Fe) is x2 then find E°(Fe3+/Fe2+) 2. The attempt at a solution We need E for Fe3+ + e ----> Fe2+. We are given Fe2+ + 2e----->Fe is x1. Reversing will give Fe--->Fe2+ + 2e (-x1)...(i) also, Fe3+ + 3e----->Fe is x2, ...(ii) multiply (ii) by 2...

Homework Statement Hi there, I have an assignment which involves using reduction of order to solve for a second solution to an ode (the one attached). However this is a method I am new to, and though I have tried several times, I'm somehow getting something wrong because the LHS and RHS are not...

Hi, I have a system that I am trying so solve in terms of m, and have two recursive equations: The problem for me is that each recursion is dependent on the value from the other! I know that they are both solvable, however I have no idea what approach I could take to express each only in...

Why can't we use the NOTE method (exercise 4.21) on the exercise 4-156 ? A = ab/3 = (10.500)/3 = 1666,66 N --> this not right

Hi, If I have 100 staff at the beginning of the financial year and is ordered to reduce the workforce by 12%, ie I should have 88 on average at the end of the year. How would I calculate the monthly percentage so the reduction of staff can be rolled out gradually. I don't want to cut 12 in the...

Homework Statement similarities and differences of AC and DC current in simple circuits. Outline using diagrams and a clear desciption the loss of energy in DC circuits and power loss reduction of AC when transmitted. Homework Equations N/A The Attempt at a Solution DC loses energy over long...

Hawking and Hertog's new paper "A Smooth Exit from Eternal Inflation?" does away with the infinite multiverse of Hawking's previous theory and proposes a cosmology that predicts "a simpler and finite universe". But I can't figure out the extent of this reduction to a "simpler and finite"...

$\textsf{a. Find the determinants by row reduction in echelon form.}$ $$\left| \begin{array}{rrr} 1&5&-6\\ -1&-4&4 \\ -2&-7 & 9 \end{array} \right|$$ ok i multiplied $r_1$ by 1 and added it to $r_2$ to get $$\left| \begin{array}{rrr} 1&5&-6\\ 0&1&-2 \\ -2&-7 & 9 \end{array} \right|$$...