Calculations Definition and 982 Threads

Homework Statement Concider the circuit shown below. Find the current iR flowing through the resitor. Find the power for each element in the circuit. Which elements are absorbing power?Homework Equations Ohm's law: U = IR; Kirchhoff's Current Law and Kirchhof's Voltage Law.The Attempt at a...

Hello, I am trying to use some functions in MathCad given in my thermodynamics textbook to calculate thermodynamic properties. I attached the functions below. I try using them and then I get an error saying too many commas I just type in: MCPH(T1,T2;A,B,C,D)= of course with numerical...

I'm making some calculations in logic and I'm using a lot of invented notation and I'm hoping that it will make philosophy more mathematical but I'm often afraid no one will care about my calculations or bother to learn how to do them. Are you ever afraid that no one will care about your...

Hi all i hope some one can help but i have a feeling there will be no easy calculations for this one:confused: Im trying to calculate actual eddy current losses in 50hz mains transformers depending on lamination sizes and can't seem to find any info on the subject that's sub electrical degree...

Hi I'm trying to make a lead screw in Creo which would be used to move a 400lb load linearly along the ground. This would be turned manually using a lever as shown in the pic (not the complete model). I have used a lead screw with a major diameter of 1 1/4 and determined the torque to move...

Hi Is this formula all i need for finding the speed i need to tip the trolley? https://dl.dropboxusercontent.com/u/72823890/Jobb/Rollover.jpg

Hi, this is my first post on this forum, although I've often referred to many posts for random information, so thanks to all the people who dedicate time to other peoples questions, I greatly appreciate it. This is my first attempt for something like this and my knowledge of physics is very...

I am trying to come up with a formula to use with my labview program that will calculate wheel torque required to move a vehicle with some given variables. I have vehicle speed, vehicle weight, % grade or angle, tire diameter. I am trying to create a dynamometer that can determine proper motor...

Hi, I've just got into my electrical engineering course and I need some help with a question of mine here. During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel...

Hi all, This is my first post. I was wondering what the effects of hydrodynamics are on water in regards to when you suck water out of a pipe leading to a barrel of water for example. When you then stop sucking the water from the pipe the water leaving the pipe then continues to pull water...

Gentlemen/Ladies, Long time reader, first time posting. I have a few projects that I would like to get done, and I realized if I don't start getting them done, I never will. Heh. I'm making mistakes calculating the resistors I would need for the following. I've done it 5 times now because each...

Hi everyone! I am writing a paper in development/experimental economics concerning how household bargaining power (i.e. how much say the husband and wife has about how to spend household income) affect how much money is spent on children. I am going to conduct an experiment and is now in the...

Answer check please -- Moment of Inertia Calculations For question 1 I got T=mnut * r pulley * gravity For question 2 I got Isystem = 1/2 M(R23 + R24 + m (R21 + R22) First day of physics lab and I just wanted to double check that these are correct. Thanks.

Hello everybody, I am working on the whole vehicle calculations, engine, brakes, suspension and engine simulation, using that software, take a look: http://www.speed-wiz.com/calculations/engine-simulation/engine-simulation-conditions.htm That software, you input the values at the top...

Hello! Finals are coming up in less than a week and I received some sample problems as review for the exam. I have my work layed out and a draft for it, but I would like some reassurance, if that's okay. :-) Anyway, here is the sample problem: You have been contacted by StM.org (Stop the...

Homework Statement You wish to invest $10,000 over 10 years. Available to you are 5 different funds. At any time you may transfer money from one fund to another without penalty or transaction fee. To optimize the money you receive at the end of 10 years you realize that you want all of your...

I need to find out the transmission loss in rack and pinion but I can't find any formulas or some general figures...

Homework Statement 1. Convert (0.333...)4to base 10. 2. Convert (0.333...)10to base 4. Homework Equations For question 1: I see this can be written as (3/4+3/42+3/43...)10 Can I just use the geometric formula and arrive at the answer 12/3=4 ? But that doesn't match...

Homework Statement I need to find i1+i2 Homework Equations for i1=0.092<-98.86 i2=-4i1-j10/25=-4i1-0.4 i1=0.092<-98.86 x=rcosθ=0.092cos(-98.86)=-0.0142 y=rsinθ=0.092sin(-98.86)=-0.0909 i1=-0.0142-j0.0909 Therefor...

All of the related work is in the attachment. If you could please help it would be really appreciated. I've asked a bunch of people in my class, and they're confused also. Thanks in advance!

Hello Everyone, First time posting on this forum and looking forward to see what you guys can teach me! I am working on a program for a Raspberry Pi as a controller for a mechanical rotary and need some help from you physics enthusiast out there. Looking for some insight on the calculations...

Homework Statement Given a vector field F=-y/(x^2+y^2) i +x/(x^2 +y^2) Calculate the curl of it the line integral of it in a unit circle centered at O Homework Equations The Attempt at a Solution I calculated that the curl is 0 but the line integral is 2π. I don't think this...

Hi all, basically we're building a model bridge (30 grams) for a mechanical engineering project out of balsa wood and kevlar (for the strings). I've attatched a pdf file of the bridge design, although it doesn't show the strings. We are wanting to do some basic load compression calculations...

I'm in a grade 12 university level chem class right now, and I'm getting a 72. I realized just today that the reason why I'm doing so poorly is because I'm good at calculations, but not questions that involve even more thinking. For instance, one question gave us some information about...

I know the formula q = mcT and that's the only formula I was taught before assigned these questions (in bold). 1. What mass of iron would be needed to have it increase by 6 degrees with 300J of heat. I am not sure what is meant by the increase of 6 degrees. How do you solve it without knowing...

Lab issue -- Please check my projectile launcher calculations I am making a lab for a class I teach and my results aren't working out and I need another pair of eyes to see if my method is wrong (I apologize if this should go in homework, but it isn't a homework question so I thought it should...

Im just wondering what is the easiest way to deal with calculations where roots are involved? For example how do you solve this one? $$\frac{\frac{1}{2}}{1-\frac{\sqrt{2}}{2}}$$Thank you for replies!

I need some maths for a program to determine the exact (or as close as it can be mathed) bond energy of bonds from the first two rows of the periodic table S and P orbitals all the websites I can find tell you what the average bond energy for a specific common bond is but that won't do for...

Hi! I was wondering how you can calculate the distance to a planet simply by looking at images when it is at aphelion and perihelion? is it even possible? Thanks!

Homework Statement I'm designing a tyre test rig for a university project to measure camber, slip angle etc. An example of a test rig - http://www.ika.rwth-aachen.de/forschung/veroeffentlichung/1999/30.06.-02.07/im173g.gif Although my test rig will be for an RC car tyres, so not quite the...

Hi there, If I perform the following calculation in Excel: =100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000+50 I get: 100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000...

I have attachted the question as a picture: my first attempt i calculated the voltage through the auxillary circuit to be 10V but i am confused of where the 0.5 A plays in this part, then i used nodal analysis to find the voltage input to the amplifier but up to that point i am confused of...

Its a while I'm trying to understand [ http://arxiv.org/pdf/quant-ph/0108132v1.pdf ] but i have problem following its calculations.The part I have problem in now is the expansion in page 14,Eq. 50.Can anyone help me understand how that is done? Thanks

There isn't a problem question really, but I think this section is most appropriate since this is a question born out of my lab module. To calculate the gradient of a line of best fit for a set of data you can use the equation M = n \sumxy - \sumx\sumy / n\sumx2 - (\sumx)2 Where...

Hello! I've got a problem that I haven't the faintest clue how to go about. I have a flywheel, spinning on a motor's shaft. I want to be able to calculate the time it will take the flywheel to spin up to the motor's max RPM, based off of the variables: Motor's RPM Motor's Toque Flywheel's...

Am I infringing copyright if I exactly reproduce the calculations in a paper on physics forums?

Hello all. I am working on a assignment in which I have to determine if a projectile traveling at a known velocity will break through a side of its containment room (assuming worst case senerios). I have been looking online and in my textbooks and have ended up confusing myself on what...

Suppose you have a hollow cube with a volume of 504c3. The inside of the cube has a psi of 94 and is just air. Now suppose that a hole opened in the bottom of this cube with an area of 12.56cm2 that leads to a hollow cylinder that is 14 cm long with a radius of 2cm. Now how would you go about...

Hello I am trying to put together a system - think of it as a mini oven that reaches temperatures of no higher than about 75-80 degrees C but normally up to about 50 degrees. Initially, I'm trying to find out what power would be required to warm a space up to that temperature. I started...

I have to find current on part of a circuit using thevinins theroem with polar and rectangular coordinates. Circuit is attached Sorry - this is a large amount of working and I can't really type it all out. Nor can i type out a circuit diagram. Find attached the question as well as my...

i'm in the conceptual design stage of my e-cycle. my tech reqs : 1. it should have a max speed of atleast 40 kmph. 2. gross weight = 120 kg 3. min range 30 km. Please help me with the following design question. how to estimate the motor & battery power requirements ?

When analysing the forces/energy transfers acting on a physical pendulum (albeit with a larger mass on the end, such as a grandfather clock...with a thick rod?) is it absolutely necessary to know the mass of the 'arm' (separate from the bob, as such)? Also, can the mass of the arm be calculated...

Why is the probability of a particle being at a certain location proportional to the square of of "the" amplitude? What does "the" in that sentence represent more specifically? Why are amplitudes complex numbers? Any intuition or clarification would be very appreciated. Thanks!

Homework Statement Taking step size h = 0.2, use Euler’s Method to determine y(1.6), given that dy/dx = ln(2y+x) ; y(1)=1.2 Record your results to 5 decimal places at each step. Homework Equations N/A The Attempt at a Solution My question is to do with the method, not the...

If I want the output of a hydraulic motor to be of a specific RPM, then knowing the pressure of the oil in the circuit, how does one calculate the LPM of the pump corresponding to that RPM?

Ok, so I am tryting to calcualte the mass of an orbiting body. I am using M = 4 * PI^2 * r^3 / ( G * T^2 ) Lets use the Earth as an example. However I am not getting what Nasa has for answers of 5.9 E24 kg. http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html Using this...

Hi there guys and girls I am new to this forum , so please have mercy. I am searching for equations to calculate the torque of a 3 phase brushless dc motor. Any info or textbooks on this maybe? Thanks Tommie Prinsloo

Can someone tell me where my calculations are going wrong. I am integrating over C2: (Note Line integral over C1 and C3 are zero.) NOTE: The vector function f(x,y,z) that I am integrating over C2 is highlighted in red in the paint doc. The equation that I am using is: ∫[f (dot) unit...

I am figuring out what are fields in Hippacros star catalogue because I am working on my own space simulator program much like Celestia and Orbiter. That data file is very new to me for my programming. Does anyone recommend any good books that teach about Hippacros for astrometrics and...

Hello, please I want to know how to calculate the overall efficiency of a concentrated solar power plant (CSP) which uses parabolic trough concentrator,so please if you can provide me with detailed information and calculation method. Thank you