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.
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...
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?
Hey guys.
Ok so here goes.
I want to know if there is a way to calculate the flux field degaussing effect of two magnets passing by each other in repelling configuration. Like south to south.
Lets say I have two magnets of neodymium N52 grade. Rockwell C scale hardness of 46.
Also let's...
Hi,
This is not really homework but since it's homework style, I'll post it here and maybe benefit someone else.
Homework Statement
I need to calculate the final voltage on Bus 2 (labeled B2 in attached PDF). I am trying to do this using per units and my attempt is attached.
The...
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
Background Information:
Clip Capacity of a Barret M82: 10 Rounds
Mass of a .50 Cal Round: 46.7 grams = .0467 Kg
Source: small arms by martin j. dougherty
Average Muzzle Velocity of a Barret M82 .50 Cal Rifle: 853 m/s
Average Specific heat capacity of normal human tissue: 3470 J/kg.C...
I am a chemical engineering student and our lecturer gave us this assignment. I completed part two of the assignment but this is part one. Nobody in my class seems to know exactly what to do. It's hard to understand what exactly he is asking for. I can write the MATLAB code once I understand how...
Hi to all.
I need to calculate the deflection at D. At point D, there is a force of 245N acting on it. If I know the cross sectional areas of all beams, is it possible to use energy method to calculate the deflection?
Hello,
I am needing help with some calculations for my project. I have to design an electric Car design and have to include some calculations. Given the maximum speed of the car is 2Meters per Second and the the mass of the car is 1.45kg:
Calculate F
And how do i calculate the torque at the...
Hello,
Two waves originated from point A and point B, waves are 'velocity-direction-dependent', can be treated as 'vectors', it took t2 time for the wave from point B to reach A, and it took time t2 for the wave from point B to reach A.
Given the fact the two vectors have the same...
Homework Statement
A cross-section of a proposed excavation for a highway corridor is to be conducted in the proximity of a house built on shallow foundation. It is expected that the original groundwater table will drop to a permanent level as shown in the figure due to the excavation. (Please...
a newbie here so not sure if this is in the right place!
i'm in the middle of a paper that I'm doing for college, investigating the effects of roughness on air flow.
i set up 2 pipes, 1 rough and 1 smooth (800mm long, 36mm diameter), in a wind tunnel, measured the velocity of the air entering...
Homework Statement
When blood pressure is measured, why must the jacket be held at the level of the heart?
I don't quite understand the answer given.
The Attempt at a Solution
It's obvious that if the the height changes the pressure reading will change due to P=ρgΔh, thus giving a...
Homework Statement
Calculate the theoretical yield of the isomers from your data. Note: Find the limiting reagent.
List of Masses I obtained during lab:
Maleic Anhydride (C4H2O3): 5.05g, molar mass=98.1g/mol
Impure Fumaric Acid: 2.28g
Pure Fumaric Acid(trans-C4H4O4): 1.45g
Pure Maleic...
I'm not sure this is the best forum but I'm trying to work out how to do the math
for a problem -
Imagine a small private jet of weigtht about 6000kg flying at about 850kph
If a constant force was applied to the nose of the aircraft - how much force would it take
to force it down to the...
Homework Statement
Number of wraps of coil on magnetic moment in field: 100 - N_c
Number of wraps of coil on Helmholtz coil: 140 - N_h
Current through magnetic moment: .796A - I_c
Area of magnetic moment: .37m - A_c
Radius of Helmholtz coil: .1635m - R_h
Current through Helmholtz coil to...
Maybe this is a dumb question...
Let's say I want to figure out the age of a rock and I have the half life of an element.
If I have this equation
y(t)=e^{kt}
where first I figure out the k-value using the half life. That part I get.
Now that I have the k-value I 're-use' the formula...
Homework Statement
See attached image.
Homework Equations
Sine law
Cosine law
The Attempt at a Solution
I'm really not sure what to do on this one. I know that the angle ABC and ACB will be the same, but after that I'm stumped. It's been a long time since I've taken a math course...
Homework Statement
See attachment.
Homework Equations
The Attempt at a Solution
Ok, so for Qd) my attempt was:
d = vt = 75x10^3 * (2*2.8*86400*365) = 1.32x10^13 m, (circumference of orbit)
because the star periodically shifts from red to blue shifted frequencies every 2.8...
Hi guys,
I have an electric motor that comes with a flange to be bolted on a plate horizontally so that the 4 screws carry the weight of the motor and the momentum it creates on them.
Could you direct me to how to calculate if the given screws and nuts stand up to the load?
Perhaps an example...
Hi guys,
I'm a mechanical engineering student and my dad want's a simplified motorized rotating table. I want to take it as a chance to implement my study in it, and I'm doing it all the way modeled on solidworks and animated.
The calculation part is holding me back, there's a couple of things...
Homework Statement
Original figure is here: http://tinypic.com/r/svrm39/6. The task is to calculate forces in N1, N2 and N5 with the correct sign.(+ or -)
The Attempt at a Solution
Figures and calculations attached. I fear it might be messy - especially when it comes to use of...
I am trying to understand how QM theory (wave-functions) are applied to Interference pattern calculations for unequal slits for a single particle double slit experiment
case 1: both slits are equidistant from the "center", however one slit is bigger and the ratio of the width between the slits...
Homework Statement
i have a 200v dc motor with 20A flowing through the armature with a resistance of 0.3Ω, how do i calculate the back emf? very confussed :(
Homework Equations
The Attempt at a Solution
I had a serious problem when I read my first book on calculus-based physics when I came to the center of mass & moment of inertia sections of my books. I really freaked myself out over the fact that even restricting ourselves to the most common & ideal geometric objects the list of things you'd...
Homework Statement
I´ll use an image to show the problem that you can see as attached file. I need to calculate a force-couple system applied to the point C in red, equal to the force f0 applied to the point E.
Homework Equations
M=fd
The Attempt at a Solution
Well in these...
this falls into civil engineering, but as we all know everything boils back to physics. and, i couldn't find any good civil forums to join.
so, i have a basic Q but need help understanding some things.
1) i am building patio cover approx 50ft long x 14ft off the house. it has a pitch...
A somewhat strange request. I have come across this paper:
http://jcp.aip.org/resource/1/jcpsa6/v98/i7/p5648_s1
It lists hybrid DFT results for dissociation calculations. I am looking for DFT calculations that are not as phenomenological, but can't seem to find any in the literature. Are...
What is the distance the upper spring is extended from its unstretched length?
Now, three masses m1 = 3.3 kg, m2 = 9.9 kg and m3 = 6.6 kg hang from three identical springs in a motionless elevator. The springs all have the same spring constant of 229.57N/m
Now the elevator is moving downward...
I believe this post is allowed here, but if it belongs elsewhere I apologize.
I am now almost at the end of my undergraduate degree and looking back over my old work and old calculations from semesters prior made me realize that I have absolutely no consistent conventions when doing physics...
Hey guys
I'm BRAND SPANKING new to posting anything an any forum ever...this is a last resort at the end of much research, brainstorming and desperate googling...
My problem:
We've built a transformer tank to house the core and this will be filled with oil, a radiator was built as well...
Dear colleagues,
I am trying to deal with quantum-chemical calculations of metal-containing coordination polymers, and I have a question which turned out to be difficult to me:
If a system includes copper atoms, which implies that it has 'unpaired' electron, how to describe a band gap in...
Homework Statement
(A+2D)T
Homework Equations
The Attempt at a Solution
I believe this would become AT+2DT. My only question then is, do I multiply the transpose of matrix D by 2, or multiply matrix D by two and then take the transpose? Thank you.
Homework Statement
Chloroethane, reacts with Oxygen according to the equation below:
2C2H3Cl + 5O2 → 4CO2 + 2H2O
+2HCl
How many moles of CO2 are produced when 3.0 moles of choloroethane and 3 mol of O2 are...
Qubits are mentioned for use for factorizing big numbers, for search engines, etc.
But, what about common calculations as multiplications etc?
Why they are not mentioned for this, are not appropriate or they are too less economic for use of this?