Calculations Definition and 983 Threads

I have a question related to linearity of power spectral density calculation. Suppose I have a time series, divided into some epochs. If I compute PSD by Welch's method with a time window equal to the length of an epoch and without any overlap, I obtain this result: If I calculate the...

I am doing experimental research on metal oxide semiconductors and graphene oxide, I also want to do some theoretical analysis. I am new in theoretical, so I need guidance how to proceed with the simple calculations, like DFT. Is there any authentic book with examples? and also is there any...

I am going to be working on some calculations for an air surge tank to minimize fluctuations downstream of the tank in an engin'e intake syste, Any suggestions/sources where I could study for this? Thank you!

A Problem is posed for a flight from Melbourne to Cairns. Using the formula for rotational speed at latitude - 1) The latitude of Melbourne is approx 38 degrees south with a rotation velocity of 820 miles/hr 2) The latitude of Cairns is approx 17 degrees south with a rotation velocity of 994...

My context here is Finsler geometry with Cartan connection. I use ##x^\mu## for the usual spacetime position coordinates, and ##u^\mu \equiv \dot x^\mu## for velocity coordinates (the overdot denotes differentiation by an arbitrary parameter, not necessarily proper time). To explain the problem...

Is there any software available to calculate cross section using .cif file?

Summary:: finding ml of two solutions by the final pH i have a NaOAc 0.1M and HOAc 0.1M , together the volume of the solutions is 20ml and the pH is 4. I need to find the volume of each solution. I've tried to solve it for hours with no successes. i found the H+ concentration (-log(h)=4 ), it...

A Spherical buoy has a diameter of 2m and weighs 3kN. It is designed to be used in a variety or circumstances by it being floated in water and anchored to the floor with a chain. Draw the free body diagram and determine the following given that the volume of a sphere is, Volume = πD3/6 The...

can i solve this problem i didnt go university due to Covid-19

A thermal flask with water of temperature 90c is placed out in room temperature 20c, sealed. How long before it reaches 55c? outer radius and height: 5cm, 25cm volume of water is 1litre. R = 0.5 Km2/W using this equation to solve it combining these two and integrating with respect to T...

1. ρmars atmosphere = 0.02 kgm^-3 volume of a sphere = 4 / 3 𝜋 𝑟^3 gmars = 3.8 ms^-2 So: Volume of a hemisphere=2/3 𝜋 𝑟^3 r=7.75 m Archimedes' principle states that the upthrust on an object is equal to the weight of fluid that the body displaces To find the upthrust produced...

Hello guys, I'm trying to calculate the torque for a 3 wheeler electric (small vehicle). 2 driving wheels and one driven wheel. At the driving wheels we have a BLDC motor for each wheel. We want to calculate the torque for resting( not going down hill) on inclined plane (angle={5,10,15...

there is many analog dividing machine that base on time counting . so does this machines work faster on height speed system such as Particle Accelerator it may help in decryption of public encryption and other coculation . It looked at relative calculator and in the speed that close to the...

How would I calculate the damage anything would take if a human were to pick up water and throw it? I would like to know this for a game idea I'm coming up with. I researched a bit online about certain physics that could apply (I.E: classical, modern, classical mechanical). I'm just not 100%...

Hey! :o We have the vectors $v=i+j+2k=(1,1,2)$ and $u=-i-k=(-1,0,-1)$. I have calculated the following: \begin{align*}&|v|=\sqrt{1^2+1^2+2^2}=\sqrt{1+1+4}=\sqrt{6} \\ &|u|=\sqrt{(-1)^2+0^2+(-1)^2}=\sqrt{1+0+1}=\sqrt{2} \\ &v\cdot u=(1,1,2)\cdot (-1,0,-1)=1\cdot (-1)+1\cdot 0+2\cdot...

John owes Kelly £500. John and Kelly have a joint account. Each of them pays £200 into the account every month, to spend on joint expenses. If Kelly pays only half of her monthly contribution into the joint account (so £100), and John pays the usual (£200) how much will John's debt (£500) be...

When designing a panel, it is imperative that you keep the components inside at a temperature which they can operate optimally at; allowing the air temperature to go above this limit can cause component failure and fire. To assist with calculating the air flow required to keep the components...

I'm not sure that this is an adiabatic process. As far as i can read, it is adiabatic if no HEAT or ENERGY is added. But pumping in molecules that are a non-zero temperature is an addition of energy, no? Anyway - my solution with the assumption of an adiabatic process. (skipping units for...

I am trying to determine the size of a single cartridge heater or 2 cartridge heaters to heat a large mass of aluminum to 400F. The aluminum block will be sitting inside an insulated (all sides) enclosure. The following are the specs for this problem. - Max surface temp of aluminum block is...

Hello, and thanks for reading. Any help with this will be greatly appreciated. One of my hobbies is amateur radio. We often use wire for antennas, and getting those wires up in high places can be a challenge. I built a pneumatic "launcher" for this purpose, using ideas from others who have...

I've some questions in the c) part of the task. The texts in the pictures are loosely translated, so let me know if there is something that is unclear. Is there a specific reason why they wrote (F' * f)' instead of (f * f)' ? I've posted a solution at the bottom of the post but I don't...

A square conducting loop of side length a is in a non-uniform magnetic field. The loop occupies the first quadrant of the xy plane, i.e. the space between the origin (x, y) = (0,0) and the point (x,y) = (a, a). The magnetic field is in the +z direction. Develop an expression for the magnitude of...

I started calculating the needed horsepower for my project copper granulator. i come out on 250hp, its very high, i think i made a fault with the formule. Cross section area ( i take blades of the rotor height * withd ) = height : 10 cm, Withd: 12 cm. 10 * 12 = 120 / 2 = 60^2 cm Yield stress...

I am performing some calculations but struck with confusion whether I am doing it correct or wrong due to contradictions of these calculations on different calculators websites. I hope here someone will help me with the validation of my calculations. Battery Capacity = 150 Ah Battery...

Summary: Find the equation of the parabola when the focus and the equation of tangent at the vertex is known. Find the equation of the parabola when the focus is ##(0,0)## and the equation of tangent at the vertex is ##x - y + 1 = 0##. General equation : ## ax^2 + by^2 + 2hxy + 2gx + 2fy + c...

Dear users, The situation I have encountered is a simple statistical comparison of the experimental data, which accepted as correct, with the results obtained via six theoretical models. In the experimental data, there exist y values corresponding to x values and also the measurement errors of...

Homework Statement: The torque is removed when the disc is rotating at 8.0 rad s-1. An opposing torque of 14.5 N m is applied to slow the disc down. Calculate the number of revolutions the disc makes after the second torque is applied, before it comes to rest. Homework Equations: T=Is W=Wo...

What is the best compiler these days – for intensive calculations? My cherished Borland PASCAL Delphi compiler has been “obsoleted” for a very long time now by MS changing their application calls, etc. And please don’t say FORTRAN, unless it has been totally overhauled. I outgrew it around 1980...

Summary: Hello; i am trying to work my way thru some motor sizing calculations on a semi-simple example so that i can more easily do it in the future. Could i get some guidance? Hello: I am trying to develop a good system for sizing motors (generally steppers). In the past i just guesstimated...

Hello everyone, I'm stuck on the question which I have provided below to do with Dirac notation: In these questions |a>, |b> and |c> can be taken to form an orthonormal basis set Consider the state |ξ> = α(|a> − 2|b> + |c>). What value of α makes |ξ> a normalised state? I'm brand new to Dirac...

When dealing with a compressed air system I would like to know how to make some calculations to predict pressure and flow rate throughout a system. e.g. If I have a compressor that can supply 50 cfm @ 100 psi at the source, and the air flows through a system of pipes, filters, turns, etc. which...

I’ve read that Urban LeVerrier was able to calculate using Newtonian mechanics the precession of the perihelion point of Mercury’s orbit (1859). Is there a website or paper that shows the calculation in detail? In particular: How would one decide on the distance between Mercury and the other...

Summary: Need to calculate the fluence of Gaussian Laser Beam: laser tip 1 cm above surface, tilted at 45 0 angle to surface. Need to calculate the fluence of Gaussian Laser Beam: laser tip 1 cm above surface, tilted at 45 0 angle to surface. Laser tip size 1 mm across Diameter 0.5 mm...

Hello there! So confused here, I tried to do some calculations with my power generation experimention. In terms of energy input, the energy output is lower. But in terms of power input, the power output is way larger. Thanks in advance! Cheers!

Can anyone confirm the claim on this site that n is greater or equal to 23 when Theta is 90 degrees and t is 3? My calculations indicate that the argument of arccosine in the numerator has to be very close to 1, but the numerator of the argument (k_laset+t) is 3.1 whereas the denominator...

I am working on an Air Blast Cannon for work and am having trouble finding the proper formulas to calibrate it. This Cannon needs to have a barrel with about a 4 inch bore. It will only be used to generate high speed air blasts, so it will not have a projectile. Are there any formulas or online...

2.1 * 10^-4m/3 Temperature 310K Pressure: 5.3 * 105 Pa So the Ideal gas formula is PV = nRT 2.1*10^-4m^3 Times 5.3*105Pa = n * Gas Constant * Temperature 2.1*10^-4m^3 (*) 5.3*105Pa = # of moles * I'm not sure what I was doing, but the whole equation stuff got hard and I stopped. I left...

I once was explained the answer to this question - something about both the air and the object being incompressible. However, for the life of me I cannot seem to reproduce the answer of why we ignore air pressure when doing basic calculations. If it matters, the particular system I'm interested...

Problem Statement: An oil with density 900 kg/m3 and viscosity 0.18 Ns/m2 flows through a circular pipe which inclines upwards at 40° to the horizontal. The length of the pipe is 10 m and the diameter is 6 cm. The fluid pressure at the lower end of the pipe is 350 kPa and the pressure at the...

as calculations are technically difficult in curved spaces, I wonder if we would obtain the same results by adding one additional (virtual) dimension in order to embed the space in a higher order Euclidean volume, just to facilitate the treatments? (for example embed a 3D hypersphere in a 4D...

So, as it says in the title, I am trying to calculate overall voltage induced in a coreless coil in the cases of it being stationary and moving in an alternating magnetic field. To go more into detail, I would like to create a mathematical model of a coil in an alternating magnetic field that...

I've been given some specifications by a company for an exhaust fan that I am looking at purchasing for my company. They tell me it is 10,900 cfm. Then given some specs on the electrical requirements. I am wondering with the information given could I check their given flow rate? I imagine that...

I have a couple of questions related to this task. The reaction that I proposed was this: NaOH(aq) + HCl(aq) <--> Na+ + Cl- + H2O (l) where as the solution manual have this net reaction, as nothing will happen with the Na+ and Cl- ions: H+ + OH- <--> H2O. I assume these reactions will...

I've recently been interested in how much energy the Earth intercepts from the Sun; the answer, unsurprisingly was an astronomical amount, measuring quite easily into the ZetaWatts. However, the maths that got me that answer got me thinking... you can use the same method to determine the amount...

Hi, I posted a question a while ago which I have managed to do some more calculations for. I need a bit of help to see if they are correct. I am trying to obtain power and torque values at different rotational speeds of a single cylinder compressed air engine. The inlet pressure into the engine...

Hello! I am trying to make some calculations on the Special theory of relativity over a practical example, considering the time dilation, but I may (more than likely..) be doing something wrong (probably with my assumptions). I would appreciate any comment on it. The example is that of a rocket...