Assignment Definition and 341 Threads

Homework Statement The concentration of the reactant A has been studied as a function of time. By a suitable plot of the data below, show that the reaction is first order, and determine the rate constant, k, and the half-life, t1/2. Use the integrated rate equation to determine [A] when t =...

Hi guys, I'm currently doing an assignment which seems to be beyond my knowledge and would like to ask for some helps. There are 2 questions I am currently stuck on: 1] A natural gas analyzes CH4, 80.0 percent and N2, 20.0 percent. It is burned under a boiler and most of the CO2 is scrubbed...

Homework Statement Let Y be binary variable P(Y = 1) = P(Y = 0) = 0.5 and X a random variable uniform on [0,5] when Y = 0 and uniform [4, 9] when Y = 1. Draw mean of X and P(Y = 1|X = x) as functions of x. What is the minimum probability of rejection to predict Y from X without mistake...

Homework Statement Density + Uncertainty of block? The mass of a rectangular block is measured to be 2.2 kg with an uncertainty of 0.2 kg. The sides are measured to be 60 +/- 3mm, 50 +/- 1 mm, and 40 +/- 2mm. Find the density of the block in kilograms per cubic meter, giving the uncertainty...

Homework Statement Decide if each of the following is a sentence or not. If the item is a sentence, is it true or false? Give a reason for your answer. If it is not a sentence, identify the part of speech. x^2 - x - 12 x^2 - x - 12 = 0 x^2 - x - 12 = (x-3)(x+4) Homework...

Hello everyone, This is my first time in Physics forums so forgive me if I stray from the convention for asking questions. Me and a friend are completely stumped on our first assignment for the year and we are not sure where else to turn! Homework Statement A particle of mass m can...

Homework Statement An alpha particle enters a uniform verical magnetic field of 1.0 T with a velocity of 2.0m/s East. a) Find the force exerted on the particle by the field. b) Find the acceleration of the particle. c) Find the radius of curvature of the path of the particle. Homework...

Hi, I'm in high school and have been given an assignment regarding heat, which is a term I don't fully understand mainly because any definition I have come across makes use of the term Energy. This leads me to my question: What is energy? I know of the existence of the thread 'What is...

Hi, I'v got the following assignment through to complete my course. I'm a bit rusty so I am really having a hard time understanding what I'm supposed to be doing here. If someone can give me the brief, basic outline of how to complete this and if C++ or Matlab would be better/easier to do it...

Homework Statement Hi! We did a resonance lab using a closed air cloumn and 3 different tuning forks, each with different column lengths and i collected the data as follows: frequency(hz) column length(m) # of wavelengths wavelength(m) speed of sound air temp 384...

Homework Statement Two charges q1 and q2 are 11cm apart and have an electric force between them of 6e-6N. If the charge on q2 is increased by 12 times and the distance between q1 and q2 changed to .44cm, what is the new electric force between these charges? q1 ? q2 ? distance (1) 11cm...

Homework Statement a beginning darts player aims a dart directly at the bullseye. the dart reaches the dartboard 0.25 s after throwing the dart. how far below the bullseye ill it land? Homework Equations The Attempt at a Solution

Homework Statement a projectile is launched from a point A and travels a horizontal distance of 28m. it spends a total time of 1.4 seconds in the air. (a) calculate the horizontal velocity of the projectile. (b)what is the magnitude and direction of the projectile's velocity at point B. Give...

Homework Statement http://i1183.photobucket.com/albums/x476/Laura_Petrea/4-7-69.gif "Where should the point P be chosenon the line AB so as to maximize the angle theta" how would i do this question?

So I had a homework assignment which I couldn't complete in time. One of the questions was what the title is about. I also asked for help earlier in the homework section. See my post: https://www.physicsforums.com/showthread.php?t=487676. Right now I just want to learn how this works for the...

"assignment makes pointer from integer without cast" elephant* get_elephants() { elephant *current, *first; int response; /* create first node */ first = (elephant*)calloc(1,sizeof(elephant)); /* THIS LINE */ current = first...

Homework Statement Which of the following are a vector spaces? (a)R = {(a,b,c) 〖 ∈R〗^3 │ a+b=0 and 2a-b-c=0} (b)S = {(a,b)∈ R^2│ a^2=b^2 }..., can I say a =b which will make things simpler? (c)T = {(f∈P_2 (R)│ f(1)=f(0)+1} Homework Equations The Attempt at a Solution...

Homework Statement Hi. So I'm stuck on a few things right now, but the main one is that Python is telling me that one of my variables is not defined. I have stressed over this for about an hour now trying everything to change it, and I cannot seem to find issue. Homework Equations...

As an assignment i need to figure out the most efficient way to convert heat to electricity and so i searched through the internet and came across Prof. Hagelstein's work which is called semiconductor technology. In short, the technology is based on the principle of thermionics by replacing a...

Can someone please break this task down as I'm so confused :'( It's due tomorrow and I would of done it sooner but I had in real life issues :\ Research into the shapes of orbits that exist in our solar system, including the motion of planets, comets, moons and satellites. I found some...

Can someone please break this task down as I'm so confused :'( It's due tomorrow and I would of done it sooner but I had in real life issues :\ Research into the shapes of orbits that exist in our solar system, including the motion of planets, comets, moons and satellites. I found some...

Homework Statement The sound intensity level 15.0 m from a point source is 64.0 dB. At what distance will it be 53.0 dB? Homework Equations Beta = 10log(I/Io) I2=(r1/r2)^2 I1 The Attempt at a Solution Found the intensity of 64dB @ 15m I1= 2.51*10^-6 Found the intensity of...

Firstly I have no idea how to tackle this one, I am not sure if we've been taught it yet or if its sort of a lead on to the next set of topics.. Homework Statement The shear stress t in a shaft of diameter D under torque T is given by t = KT / \PiD3. Determine the approximate error in...

Please Help! Mechanix problem assignment Homework Statement Please help me do my assignment in dynamics of rigid bodies. It's more on kinetics of particles and I have difficulty in figuring out how to draw the free body diagram of the blocks.. Question 1: The 20 lb block A and the 30 lb...

Homework Statement I'm writing an assignment about Extreme Sports, including Skydiving and Bungee Jump, and since I'm not that good at physics, I was hoping that maybe some of you guys could help me! I am to analyze a skydiver, and chop the fall into phases, and use both math and physics...

The question is as given in the image attached entitled 'amplifier question' I would just like someone to check my working and verify whether it's correct or not. Thanks. And also want to ask on the second part which is 'what mathematical operation does this circuit perform?' Any help would be...

Homework Statement There's an equilateral triangle with three objects on every corner. Corners named A, B, and C. The mass of each: A - 5.5 kg B - 7.5 kg C- 10.0 kg The sides of the triangles are also 5.0 cm each. There are no other forces acting on the corners. How do I calculate the net...

Homework Statement There are 4 questions in the assignment. None of them need calculation. The questions is as attached below. Homework Equations None. The Attempt at a Solution 1. I think the "photoconductivity" is a typo, should be replaced with "photoconductor". From Wiki, I...

Homework Statement we just learned the concepts of statics TODAY and were given an assignment immediately, so any help would be appreciated. A window washer attempts to lean a ladder against a frictionless wall. He finds that the ladder slips on the ground when it is placed at an angle of...

Hi. I need help with in running my program, when I tried it in the computer lab, my program didn't run..And I'm sure it couldn't run because of my workings..which I assume are incorrect. I appreciate it if you could tell me where did I go wrong with my calculations and if it matched the...

When given y'' + ay' + by + c = 0 The characteristic equation is: λ^2 + aλ + b = 0 Now I'm making a substitution of e^(λx) to get [(λ^2 + aλ + b)][e^(λx)] = 0 double root : [(λ - alpha)^2] [e^(λx)] = 0 My question now is that if I were to do the same thing with the...

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 11%. Find the ratio (r)max/(r)min where (r)max is the moon's maximum distance from the center of the planet and (r)min is the minimum Ok...

1. At a time when mining asteroids has become feasible, astronauts have connected a line between their 3500-kg space tug and a 6200-kg asteroid. Using their tug's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 450 m apart. How much time...

So I have a design assignment, I need to construct some 3D CAD drawings. I have basic exp with Pro/E but I've heard Solid works is the best software to use. So out of AutoCAD Inventor / Solidworks / Pro Engineer. Which is the most straight forward on to use?

Assignment of Variables please Help! Ok well I am very confused on what variables you assign for the velocity addition equation. What is U' , U , and V? like let's say 2 rockets heading toward each other and I want to find the speed i see if I'm on one of those rockets. Also as a bonus I...

I was going to put this up in the homework forum, but I feel the folks down here are more capable of helping me out. I have to do an assignment, but I cannot go in for office hours to get help from my professor. Regretfully, I lost the sheet and forgot to grab another until just a few days...

Homework Statement For my engineering assignment we are working in a group to research, build, test, and write a report on an observation deck. The little fork in the road we've hit is determining the tension in the cables. There needs to be a moment produced once there is between 20 and...

My physics teacher gave us this follow-up to the classic loop-de-loop assignment where you have to calculate the height from where you have to drop a ball in order for it to just make it round the loop. The problem with this assignment is that our teacher refuses to help us, and there are no...

Homework Statement I've already figured out the code for part 1 of the assignment. I'm stuck on part 2. Specifically, I'm not sure how one would obtain the values for the multiplier and multiplicand from R6, as the notes from the professor in the code claim, nor how to format the result in...

Homework Statement Heat of Reaction for the combustion of Magnesium Data: A. Mass MgO = 0.7975g Volume 1M HCl = 97.5 ml Temp.intial = 24.2 C Temp.final = 29.3 C \DeltaT = 5.1 C B. mass Mg 0.0896g Volume 1M HCl 89.5 ml Temp...

Hello, i seem to have a conundrum on my hands that i hope the kind people on here might be able to give me some tips about how to handle. I am currecntly working on my bachelor degree in physics, and have one more year before I'm finnished with that and will go on to my masters(and finally...

I've been out 8 days and i missed this entire chapter, with a test on monday so I am trying to get all caught up. but i don't know how to do any of this homework. Homework Statement the mass is 3.80 kg, T = 16 N, and = 35 degrees. The surface has no friction. If x is horizontal and y...

My course is supposed to go from basic vector algebra to extrema, curl and divergence, (stopping before multiple integration) I don't need any help on this assignment I am just wondering how hard it looks compared to everything else. http://tinypic.com/r/2ly29u8/6

Homework Statement Your physics assignment is to figure out a way to use electricity to launch a small 6.0-cm-long plastic drink stirrer. You decide that you'll charge the little plastic rod by rubbing it with fur, then hold it near a long, charged wire. When you let go, the electric force...

CIRCUITS Assignment Help Please :) Homework Statement Alright I was given an assignment and I have done all the questions, but I'm not sure if they are right and would like some help if they aren't. 1. A wire has resistivity 5.6 x 10^-8 Ωm at 20 °C and a temperature coefficient of resistance...

Place the letters A, B, C, D, E, F, G, H and I into a 3x3 square grid with each square containing a different letter, using the following information: (i) I is in the same column as E which is not in the center column. (ii) D is in the row below the row which contains F. (iii) A is in...

Hi there, I'm new to the forums so pardon me if i make mistakes such as posting to the proper forum. Homework Statement I need to investigate and analyze conditions needed to maximize the efficiency of common natural or industrial reactions and explain how the improved efficiency of the...

hey everyone, I'm a 3rd year uni student studying software engineering, and I recently got my first job working in an IT office at my school. One of my first assignments is to combine two Perl modules that deal with the Apache web server. I've never done work with Perl or Apache before, but...

Homework Statement It's an extra credit assignment assigned by my math teacher, I sort of tried it but I'm not very good, and not too sure what else to do, this part isn't my strong suit. Here's the problem: (A) "If my son would live forever and he grows 1 inch this week, 1/2 inch next...

Statics assignment a bit urgent So here is my assignment. i wish that someone could help me. now i know that this system is statically determinate and that i can compute the forces. my problem is that i cannot figure out how i can compute the moment. the Aim of the assignment is to find all...