What is Calculation: Definition and 1000 Discussions

A calculation is a deliberate process that transforms one or more inputs into one or more results. The term is used in a variety of senses, from the very definite arithmetical calculation of using an algorithm, to the vague heuristics of calculating a strategy in a competition, or calculating the chance of a successful relationship between two people.
For example, multiplying 7 by 6 is a simple algorithmic calculation. Estimating the fair price for financial instruments using the Black–Scholes model is a more complex algorithmic calculation.
Statistical estimations of the likely election results from opinion polls also involve algorithmic calculations, but produces ranges of possibilities rather than exact answers.
To calculate means to determine mathematically in the case of a number or amount, or in the case of an abstract problem to deduce the answer using logic, reason or common sense. The English word derives from the Latin calculus, which originally meant a small stone in the gall-bladder (from Latin calx). It also meant a pebble used for calculating, or a small stone used as a counter in an abacus (Latin abacus, Greek abax). The abacus was an instrument used by Greeks and Romans for arithmetic calculations, preceding the slide-rule and the electronic calculator, and consisted of perforated pebbles sliding on iron bars.

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  1. C

    Hubble redshift and calculation of galactic rotation curves

    I am interested in whether it is necessary to account for the effects of the Hubble Redshift in determining the rotation velocities of galaxies exhibiting keplerian motion and, in particular, whether the associated spatial expansion of the Universe is known to result in spectral shifts that...
  2. Lance Fernandes

    Solve Phys Calculation Problems | Grade 10 GCSE Exams

    Okay, I've got a major problem. It's doing calculations in physics. Especially when it comes to electricity, momentum, force...I aways get stuck when doing the question paper. I LOVE partile physics and astrophysics, but I'm not really that good at everything else...and I'm scared that this is...
  3. K

    Understanding the MMX Calculation Problem: Vertical vs. Horizontal Analysis"

    Hi All, MMX has been discussed a lot but I could not find solution to my problem. So, I had to start a new thread on this subject! Sorry it is lengthy, you can just read the last paragraph (below red text) for short form. I was going through details of the calculations and have problem at one...
  4. B

    Work Hardening percentage calculation

    Plate previous cold-worked 20% is 50 mm thick. It is then cold-worked further to 33 mm. What is the total percent cold work? I know %CW= (Ao − Ad/ Ao) x 100 I know the answer should be 47.2%, but I don't get that. What are the first steps I need to take?
  5. S

    Calculating Net Work: A Box Being Pushed Across a Floor

    Homework Statement a box is pushed horizontally across a floor with a force of 70 N to the right. There is a friction force also acting on the box in the opposite direction of 18 N. if the box is displaced 8 meters. what is the net work done on the box? Homework Equations W(net)= Fd cos...
  6. MelkoRR

    Calculation of a comet orbiting Sun

    Homework Statement a comet is orbiting around the Sun in a parabolic orbit . center of the sun to perigee of the comet's orbit distance is 58 km . find the time required for the comet to transit into the Earth orbit around the sun . Homework Equations The Attempt at a Solution no clue
  7. Ayesha Shafique

    Homework help: Distance and time calculation

    1. If a cyclist travels at 9 km/hour what distance will he cover in 30 seconds?2. a) 75 m b) 7.5 m c)15 m d) 150 m3. My guess is that its 75 m.
  8. A

    Calculation of different natural frequencies of a material

    Hi, As far as I know, every material has different sets of natural frequencies associated with it. For example, A simple one dimensional oscillator with stiffness "k" and mass "m" has a formula for calculating its natural frequency = 1/2pie*squareroot(k/m). I was wondering if there are...
  9. R

    Calculation for knowing duration of gas cylinder

    I know the total volume of a gas cylinder, the pressure in it, and the outlet pressure that needs to be maintained. The flow rate is also known. How should I calculate the total duration the cylinder will last? Also, what should vary if the cylinder is a liquidified gas cylinder?
  10. Byron Rogers

    Calculation of the volume of an ellipse cone

    I am trying to work out a formula for the approximate calculation of the lung capacity of a racehorse. http://performancegenetics.com/wp-content/uploads/2015/05/Horse.jpg I take three physical dimensions on the horse. 1) The measurement of the girth (which is the perimeter of an ellipse)...
  11. smruti

    Power Calculation: S=VI & V*I Meaning

    in the calculation of complex power S=VI we sometimes use S=VI* and sometimes as S=V*I.what is the physical significance of these two notations and in which case these two expression has different meaning?
  12. S

    Calculation of the energy from a pulse

    Hello I need help for a basic question (i am awful in physics) :confused: I have two capacitors in parallel when they are charged up (18.5 kV) they release the energy to a discharge device. The discharge device releases the energy in the form of electric pulses through two electrodes in a...
  13. E

    Efficiency calculation for solar cells

    Homework Statement Hi! I have a problem with the following problem: Calculate the efficiency of the solar cells with the characteristics given in the table below Power (28 degrees, BOL): 300 W/m2 Absorptance: <91 , emittance: >82. Reliability: 0.999 . Mass: 2 kg Homework Equations I know...
  14. M

    Impact force calculation of a Full Suspension Mountain Bike

    Hello Folks! I want to find the maximum applicable force on a full suspension mountain bike and i will use this force on a FEA software structural analysis for a uni design project. This bike has a rear suspension with 400 lbs/in spring rate.Also rear wheel vertical displacement(travel amount)...
  15. 2

    Supersonic wave and distance calculation

    To calculate the distance from a stationary visible object using the speed of sound when dealing with a supersonic blast wave from that object, how would one proceed? Is the standard 340m/s good enough reference? How is the velocity reduction over time and distance? Does all the variables...
  16. Matthew Titus

    Engineering Torque calculation to determine motor size

    < Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > Hi guy's this is my first post so forgive me if i leave anything out. I'm designing a solar tracking device that needs to be mounted on a roof and i need help calculating the torque required...
  17. aylakadamk

    Calculation of proton's lifetime

    Hi, In a Particle Physics class, our instructor requested me to calculate the life time of proton. There are some sources telling that its life time is ~10^32 years, however there are no basic calculations. There is this article about calculation...
  18. K

    MHB How Can I Calculate Call Traffic for Optimal Caller and Receiver Allocation?

    Hi, I'm in a bit of a fix with this problem and as such if someone were prepared to help me get to get to a point where I had a formula I can re-use I would be happy to pay a small bounty. Paypal donation, Amazon gift... something like that? My problem is one of calculating call traffic. I...
  19. Smirnoff103

    Calculate Car Impact Force on Steel Structure | Help Needed from Belgium

    Hello, I need to calculate the impact that a car (small car) has on a metal structure. What I know: The mass of the car : 99 kg, the velocity of the car : max 3 km / h -> 0,833333 m / s Thus the force of the car at 3 km / h is 82,5 Newton. Now I need to know how much that metal structure can...
  20. H

    Calculating Star and Planet Positions in the Night Sky: A Mathematical Approach

    Hello to all of you, my question is:how to calculate the star or planet position in night sky? give me a methemetical formula...
  21. A

    Where is my calculation of sun angle incorrect?

    Hi there, I hope this is the right place for this question and furthermore doesn't appear rude that my first post is a question! If so, I do apologise, I haven't been able to find an appropriate place to ask this. I'm working on calculating the position of the sun at a given day of the year for...
  22. C

    Cross-flow Heat Exchanger 2 phase calculation

    Hi all! I'm working on a project of heating water from exhaust gases of kamin's chimney. I have a cross flow heat exchanger (see pdf). we have done calculations of heat transfer rate and the outlet temerature of the water, and got 150C. so it probably gets boiled somewhere inside the HX. I need...
  23. M

    Calculating Axle Loads for a Firefighter Vehicle: A Statics Problem

    Hi, my name is Goran and I have a physics/mechanics problem. I'm a 3D artist and I do 3D CAD or non CAD models for a company I work at. New job I got is basically a engineer because I'm about to get my mechanical engineering degree, but it has been a long time I actually calculated something so...
  24. R

    What is the percentage uncertainty in V when L1-L2 is 30?

    Homework Statement My homework question says: the uncertainty in length 1 is +/- 0.1 and in length 2 is +/- 0.1 : calculate the percentage uncertainty in V where V L1-L2 is 30Homework Equations V= (1/(L1-L2))^0.5 where L is the length[/B]The Attempt at a Solution So what I did was add...
  25. D

    Hoyle's calculation of 7.65 MeV level of carbon nucleus

    Mass of helium-4 (4.0015 u) plus mass of beryllium-8 (8.0053 u) gives 12.0068 u, which is 6.35 MeV above fundamental level of carbon-12. For triple alpha process T= 100 MK, which corresponds to a kinetic energy of 2 x 3/2 kBT = 0.03 MeV for the particles. This amounts to 6.38 MeV, way below 7.65...
  26. J

    Simplifying Complex Calculation

    Calculate ( minus ( 2 over 3 ) + ( 2 over 3 ) i ) to the power minus 4, simplifing your answer and giving it in the form a + i b, with a and b given exactly.I found the modulus by: sqrt((-2/3)^2 + (2/3)^2) = (2*sqrt(2))/3 the argument is: pi - 1 (from a sketch in the complex plane) hence...
  27. W

    Calculating Mean Curvature of a Scalar Field | Homework Solution

    Homework Statement Consider the scalar field φ=x2+y2-z2-1. Let H be the scalar field defined by H = -0.5∇.(∇φ/ abs(∇φ)), where abs(∇φ) is the magnitude of ∇φ. Which makes that some sort of unit quantity. When H is evaluated for φ=0 it is the mean curvature of the level surface φ=0. Calculate...
  28. B

    Calculation of Counterbalance Mass

    Hi, I've been grappling with a calculation that appears to give me a good result, however my gut feeling says other wise. Could someone please check the layout and possibly confirm my final answer. Attached is the layout of the system. The system: -There is a long arm, d1+d2 is one link. then...
  29. A

    Calculation to find the torque required to start an engine

    I need to design starter motor based on the the torque required to rotate the flywheel and reciprocating mass in the engine.How to do the calculation .I have already done a part,i feel something more to consider
  30. gracy

    Is the Calculation of Lattice Energy Correct at Time 2:40 in This Video?

    In the following video,is he right at time at time 2:40 I don't think so .Because lattice energy of fe2o3 should be 36 times greater than Nacl (without considering radius factor)
  31. S

    Steam consumption calculation on a steam exchanger

    We are having a steam heat exchanger. Its made up of finned tubes. Tube id 22.7mm Tube od 26.7 mm Tube length 1310.0mm Tube material ss304 Fin od 66.0 mm Fin thk 1.5mm No of fins on one tube 260 Fin material ss304 Total no of tubes 10 Supplied steam pressure 3.5 kg/sqcm A inverted bucket...
  32. Safinaz

    Calculation of B to l nu decay width

    Hi, 1. Homework Statement In the calculation of the matrix element amplitude of ## B \to l \nu ##, I got a factor ## \bar{l} (1-\gamma_5)\nu ## as in [hep-ph/0306037v2]. For ##|M|^2## I made : ##| \bar{l} (1-\gamma_5)\nu|^2 = (/\!\!\! p_l+m_l) (1-\gamma_5) /\!\!\! p_\nu(1+\gamma_5) =...
  33. K

    Fuel evaporation in a tank - Pressure calculation

    Hello everybody, I have the following problem: I have a fuel tank, with a liquid phase (the fuel) and gas phase at To and P0, where T is temperature and P pressure. I assume that the gas phase at the instant t=t0 is air. (Is this assumption correct?) The temperature of the liquid phase...
  34. A

    Calculating Worm Gear & Stepper Motor for Single Axis Solar Tracker

    Dear all, I am trying to build single axis solar tracker using worm gear, I need guide line for calculation of worm gear & stepper motor .he are some relation i taken, But i wanted whether its correct & need to explain with example efficiency= (output Power of Worm gear/ Input Power of...
  35. J

    Center of pressure calculation

    1. The problem statement: A removable plate is mounted in the end of a swimming pool. The plate is 60cm square with the top edge 30cm below surface of water. Compute the force on plate and distance to centre of pressure below surface of water. 2. Homework Equations . 3. The attempt at...
  36. IamDev

    Help with torque calculation of underwater rotating disk?

    Hello Guys, I have a disk of diameter of 150mm and thickness of 10mm which is rotating at the constant speed of 100rpm. The disk is inside water which is approximately 4-5 cm below the surface. Disk is horizontal (parallel to the water surface). Disk is attached with the shaft of the motor. At...
  37. B

    Quick stress calculation with one force on an I-Beam

    Homework Statement Determine the state of stress at point A on the cross section of the beam at section a−a. TakeP = 33kN . Homework Equations σ = My/I The Attempt at a Solution Moment = Fd = 33000N(500mm) = 165000000 Y = 90.71 (100-9.29, 9.29 being the Ybar of the little piece) I =...
  38. E

    How Do You Calculate Torque for a Rotating Shaft with Bearings?

    Hello Guys, I have a 90mm=3.543" shaft going through 2 bearings that are the same shaft weighs 10lbs bearings weigh 25lbs each hub of bearing weigh 5lbs, bearing coefficient of friction is 0.15 bearing OD: 190mm ID: 90mm ok so I thought Torque to rotate shaft is = Moment of Inertia x angular...
  39. C

    Enthelpy of reaction calculation?

    Limestone stalactites and stalagmites are formed in caves by the following reaction: Ca2+(aq) + 2HCO3-(aq) --> CaCO3(s) + CO2(g) + H2O(l) . If one mol of CaCO3 forms at 298 K under 1 atm pressure, the reaction performs 2.48 kJ of P - V work, pushing back the atmosphere as the gaseous CO2 forms...
  40. X

    Error in angular magnification calculation

    Homework Statement The wing of an insect is 1.7 mm long. When viewed through a microscope, the image is 1.4 m long and is located 5.9 m away. Determine the angular magnification. Homework Equations di/do=hi/ho M=beta/alpha alpha=object size/object distance beta=image size/image distance The...
  41. L

    Calculation of movement caused by a change in pressure

    Homework Statement Imagine you have an unflatable closed cube (z x z x z) which is connected to a chamber with a constant pressure of 6 bar (so the pressure in the box is also 6 bar). The box is hanging on a wire in a room in which the pressure is 1 bar. At t=0 a small part of the bottom of the...
  42. Alex734

    Calculation of the tangential forces in a turbine blade

    Dear All, I am trying to perform the static analysis of turbine blade in ANSYS. And i have a problem with finding the values of tangential force. How can i find it, if have following data: operating speed - 3000 RPM, stage power - 1413 kW, axial load 5544 N, number of blades - 45. Thanks a lot!
  43. V

    Calculation of total ionization cross section

    Hai all, I need some help in understanding the calculation of total ionization cross section. As per the literatures, for a gas capable of multiple ionization, the total cross section is a charge-weighted sum of partial ionization cross sections. To be more elaborate, consider the case of...
  44. Dustin11H3

    Angle/Coordinate Calculation for two "Pulley" System

    Hello everyone. This is my first post on here. I figured that I would give it a shot. Just as a quick background: I'm studying electrical engineering and I'm working an internship for a machine manufacturing company now. One of the projects I have been assigned is to come up with a system to...
  45. A

    Downforce Calculation for a wing Formula Source

    Hey guys, The following formula is provided on the wikipedia page for downforce, D=0.5(WS)*H*alpha*F*rho*V^2 Where: D is downforce in Newtons WS is wingspan in metres H is height in metres \alpha is angle of attack F is lift coefficient rho, ρ, is air density in kg/m³ V is velocity in m/s...
  46. PrincessIceFall

    Review centre of gravity calculation

    <<Mentor note: Thread merged with duplicate from other forum.>> Half an octagonal prism. A small weight is placed 2 cm from the centreline of the vessel. The rod on which the weight is on is placed at (L/2) i.e at the center of the length of the vessel. The height of center of gravity from the...
  47. evinda

    MHB Calculation of errors

    Hello! (Wave) We consider the initial value problem $$\left\{\begin{matrix} y'=y &, 0 \leq t \leq 1 \\ y(0)=1 & \end{matrix}\right.$$ We apply the Euler method with $h=\frac{1}{N}$ and huge number of steps $N$ in order to calculate the approximation $y^N$ of the value of the solution $y$ at...
  48. E

    Rack and Pinion Calculation help

    Just to be aware this isn't homework this is a design concept and although calculations aren't required I'd like to assess a rough assessment of possible power generation figures. The concept is a weight which pushes down upon the rack hence turning a pinion on a shaft which has lots of of...
  49. M

    Integral Calc: Find My Mistake - 4.75

    Hi, I believe I have a calculation mistake but I don't know where. The correct answer is: 4.75
  50. N

    Calculation of particles by integral

    Hi, I would like to calculate total number of particles in one periodic wave-section whose radius varies by h(z)=1+A*sin(2*pi*z/L), where A is the profile amplitude and L is the wavelength of one wave-section. I thought, I will do by volume integration, say integral over V (volume of one...
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