Homework Help

Hi all Im currently studying for an HND in mechatronics engineering. Working on an asignments for PLC's Im stuck on a part of one question! Its "what can BCD numbers do that pure Binary or Hexadecimal numbers cannot?" Im struggling like hell to find an answer on the net, can anyone help?

My mind has totally gone blank! would anyone happen to know where stinging nettles get their energy from?

Hi All my question is how to differentiate labeling ethers and "oxy' From my notes, an ether is R-O-R one question was draw ethyl vinyl ether which i got correct (CH3CH2OCH=CH2) now i have a question asking for the reverse; give the systematic name of the structure: CH3CH=CHOCH2CH2CH2CH3 and i thought it was propyl ethene ether but the answer is 1 butoxy 1 propene confused to say the least any help would be appreciated

I am stuck writing a conclusion for this lab because I really didn't understand how mechanisms Sn1 and Sn2 relate to the lab. Can someone explain the purpose of the lab and whats going on? -In the first part we did the synthesis: the preperation of tert-amyl chloride with 20 mL of 12M HCL and 12mL of t-amyl alcohol using a seperatory funnel and then a simple distillation. I am supposed to calculate the percent yield and have no idea how to. The weight of t-amyl chloride at the end was 5.66g? -Second part was mechanism: relative reactivity of alkyl halides I placed 4mL of 2% ethanolic silver nitrate solution in each of six test tube with 3 drops of a different alk…

I'm doing my integration homework, and I can do the integration fine, but one of the functions i've got now is [math] 4x^2 + \frac{1}{x^2} [/math] It asks me to find where this function crosses the x-axis, ie. Solve it. But seeing as there are positive and negative powers of x I don't know how to go about solving it. I thought maybe you could do the following: [math] 4x^2 + \frac{1}{x^2} = 0 [/math] [math] 4x^4 + 1 = 0 [/math] [math] (2x^2 + 1)^2 - 4x^2 = 0 [/math] [math] So -2x^2 + 1 = 0 [/math] [math] 2x^2 - 1 = 0 [/math] [math] (\surd{2}x + 1)(\surd{2}x - 1) = 0 [/math] [math] x = \frac{\surd{2}}{2}... or... x = - \frac{\surd{2}}{2} […

Hello Everyone! This is my first time posting on these forums. I am a student that is currently taking general Chemistry in college -- this is my first semester. During one of our online quizzes, we were posed with the following question: Oxygen gas effuses at a rate of 0.0140 moles/sec through a small hole. A second gas effuses through the same hole at 0.0174 moles/sec at the same temperature, calculate the molar mass of the gas. A.) 28 B.) 77 C.) 63 D.) 50 E.) 51 Here is my work: RO2= .0140 RX= .0174 RO2 .0140 / RX .0174 = √[Molar Mass X / Molar Mass O2] = √[Molar Mass X / 32] (.0140/.0174)2 = Molar Mass X / 32 32(.0140/.0174)2 = Molar Mass X 2…

Hello, I'm trying to find the Volume of this solid by the Shell Method but can't figure out what the height of the shell is for this: rotation about x-axis of region bounded by y=x^2 and y=6x+7 the formula should be: Volume= 2pi int(radius*height) dy from 0 to 49. I know radius is y. But what is the height?

Hello. My homework requires me to find the volume of a solid by shells but my Math teacher only explained a simple exam with only 1 function revolved about the x-axis or y-axis where the radius is either just "y" or "x". In my homework, I see questions like this: Find Volume by shell method of region bounded by: y=6x+7 and y=x^2 about the line: a) x= -1 b) x= 7 I don't know how to find the radius here. My attempt at "a)" was: integral of 2pi*((-1-x)(6x+7-x^2))*dx from -1 to 7 but that gave me a negative answer. Can someone explain to me how to usually find the radius and height of the shell for questions of this form? Thank you.

I just need to be pointed in the right direction so I can figure these answers out. Thanks in advance for anyone willing to help. 1. Culture media must provide many essential components in the artificial environment of a broth or solid medium. List the minimum items that must be provided for the successful growth of organisms and indicate what their role is for the organisms. 2. In addition to the items listed above, what other considerations must be considered once you have provided the above list and why? 3. Water from the tap is rarely ever used to make medium. Why? 4. How are selective and differential media different. How can the two be combine…

A hollow sphere with an inner radius r=1 um, and an outer radius R=1 cm is made from copper. A current flows radially; for example, from inside toward outside. Find the resistance of the sphere. The resistivity of copper is p=1.7 * 10^-8

In my dotage I've decided to revisit a textbook I still have from a class I took about 10 years ago. The book is Basic Technical Mathematics with Calculus (Seventh Edition) by Allyn J. Washington (Addison Wesley Longman, publisher). The specific problem is meant to illustrate the correct rounding techniques as they apply to practical math problems. These techniques concern accuracy (significant digits in multiplication and division) and precision (the decimal position of the last significant digit in addition and subtraction). The problem is presented as follows: (3872/503.1) - (2.056*309.6/395.2) I first evaluated each of the groupings using the principle…

I agree with Mooyepoo 100% that Shay's post is obviously a case of a student not reading the course material provided. The questions he posted are very basic water/wastewater treatment questions that don't require any sophisticated knowledge or any math beyond simple arithmetic. If Shay had read the course material he would have encountered the conversion factors that would have enabled him to work these problems. The thread is locked (appropriately), so I won't repeat the questions he posted. I would suggest to Shay that he actually read the course material provided. Pay attention to such things as: 1 L=1000 ml, 1 ppm=1000 mg/L, 1 ppb=1000 ppm, ~0.43 psi=1 ft of H2O…

I know to find the slope of parametric equations you find dy/dx. If you are given the parametric equations and you find an answer in terms of t for the gradient and you are given points in terms of x and y. E.G. Find the tangent of x= 1 + lnt, y= t^2 +2 ; (1,3) I get dy/dx = 2t^2 Now the text book is not very clear... What should I do with the 2t^2 and what should I do with this to find the equation of the tangent? Must I find what t is equal to at that given point or should I eliminate the parameter? at y = 3 3 = t^2 +2 therefore t = 1 or t = -1 (but t cannot = -1 because of the terms of x for real numbers) therefore you substit…

hello i am in grade 12 advanced functions and i help with this trigonomatrie question. prove: Sec^2(teta) + cosec^2(teta) = cosec^2(teta) x sec^2(teta) for the first step i picked the left side to prove, 1/cos(teta)x 1/cos(teta) + 1/sin(teta) x 1/sin(teta) is this right? could somone help me wit hthe next step thanks.

It seems to me that a dumb person calculating 10 hours a day suceed with sciences better than an intelligent person studying 10 hours a month. What weighs more, study or smarts? And does intelligence matter at all? Does it have any impact on the study?

Can someone explain to me how heating soy milk affects its whey content?

Can we observe Doppler effect, if the source of light, say Sun, is stationary and we are moving towards it? And what would happen for the same case if the observer is moving with the speed of light? Thanks in advance and sorry for my ignorance, if any!

Ok, this isn't a very important question, but I was finding seemingly conflicting info online. Does the cytoplasm include ribosomes? Edit: this isn't homework, I just thought that it fit best with this forum.

Given any two nxn nonsingular matrices A and B, prove or disprove the following statement: If AB=-BA, then at least one of the A and B is singular. i tried to use the characteristic det = 0 but nothing really happened. Please help

this is my mid term and idk how to do any of these problems. i know it says dont give answers but can you at least show me examples of how to do these equations because i have no clue 1) A 500 ml aqueous solution contains 0.005 mg of arsenic. What is the concentration of arsenic in terms of ppb? 2) How many feet of water (depth) are in an open reservoir 80 ft. in diameter if the pressure at the bottom outlet is 50psi? 3) What is the detention time of a settling tank with a 40 ft. diameter and a side water depth of 15 ft. with a flow of 10,000 gpd ? 4) Determine the BOD 5 for the following. Initial DO = 9.6 mg/L 5 Day …

this is my mid term and idk how to do any of these problems 1) A 500 ml aqueous solution contains 0.005 mg of arsenic. What is the concentration of arsenic in terms of ppb? 2) How many feet of water (depth) are in an open reservoir 80 ft. in diameter if the pressure at the bottom outlet is 50psi? 3) What is the detention time of a settling tank with a 40 ft. diameter and a side water depth of 15 ft. with a flow of 10,000 gpd ? 4) Determine the BOD 5 for the following. Initial DO = 9.6 mg/L 5 Day DO = 4.3 mg/L Sample Volume = 5 mL 5) What is the hydrostatic pressure at a custo…

I have attached the file below , with questions, thanks in advance. Exercise_2.pdf

Hey, Im learning about algorithms in class and had a few problems which were given to us. Im not sure if im doing them right and so im posting them along with the answers that I have to them and a few that I dont. Any sort of guidance would be appreciated. Thank you Here are the answers that I have for them. They are all big-theta of a) (logn logn) b) Need Help c) (logn) d) Need Help e) (1) f) (n^0.7) g) (logn + n^ 0.2) h) (n) i) (logn) j) (logn) k) (nlogn) l) (n^2)

I am not able to solve some questions so I decided to post them on yahoo answers. I got answers to some of them and I just want you to check them. But some others I don't understand at all. NOTE : PLEASE DO THE QUESTIONS ONLY IF YOU ARE 100% SURE Here are the questions. #1 - #5 ** ANSWER PROVIDED CHECK IT PLEASE ** 1) Suppose that x^2-6x-3 <= f(x) <= sqrt(9-x^2) on [0,3]. Give upper and lower bounds for lim x->0+ f(x) and lim x->3^- f(x) lim (x^2 - 6x - 3) = -3 as x --> 0+ lim sqrt(9 - x^2) = 3 as x -->0+ -3 = f(x) = 3 lim (x^2 - 6x - 3) = -12 as x --> 3- lim sqrt(9 - x^2) --> 0 as x --> 3- -12 = f(x) = 0 …

Alright, I'm new here, so hopefully I can get the problem and my work across well. Textbook Problem: A vector field D = aR(cos2(Phi))/R3 exists in the region between two spherical shells defined by R=1 and R=2. Find Integral D.ds and Intregral Gradient.Ddv. Note the vector (aR = R). ** Integral D.ds ** dsR = RR2sin(Theta)d(Theta)d(Phi) **From textbook D.dsR = (cos2(Phi)/R3) R2 sin(Theta) d(Theta) d(Phi) Intregral (from 0 to 2pi) Integral (from 0 to pi) (1/R) cos2(Phi) sin(Theta) d(Theta) d(Phi) **Double integral for surface area Intregral (from 0 to 2pi) (1/R) cos2(Phi) (-cos(Theta) | (from 0 to pi)) d(Phi) ** -cos(pi) = 1; -cos(0) = -1; 1 - (-1) = 2 Intreg…