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.
Two unlike charges attract each other with a force of 5 x 10^-5 when placed 12 cm apart.
1) What is the force between them when they are 4.0cm apart
2)At what distance apart will the force between them be 2.0 x 10^-4
now i have attempted these questions, but i cannot find a...
Hi,
a few months ago, someone pointed me to an excellent primer on lattice calculations, available for free on arXiv. I was browsing and finding many results, so I was wondering if anybody had a good reference, including worked examples so one can readilly do such easy things as calculating...
Hey folks,
Sometimes I see the calculation of the vacuum energy written as:
\int\frac{d^3k}{(2\pi)^3}(k^2+m^2)
and sometimes written:
\int\frac{d^4k}{(2\pi)^4}log(k^2+m^2)
See for example http://arxiv.org/abs/hep-ph/0105021 equation9.
Does anyone know why you can increase the...
i have been set a question to draw the shear force and bending moment diagrams for the loading condition shown on the diagram, and am not quite sure how to do this...
do i need to work out other forces along the diagram?
and help...much appriciated thanks!
I need to solve this problem:
A gas of 5.00 L hydrogen with temperature 300 K and pressure 1.013 x 10^5 Pa.
The molar mass of Hydrogen is 2.016 g/mol.
a) find the translatinal kinetic Ktr energy of the gass
b) if the gass is contained in a container which is moving 300 m/s what is the...
I'm trying to work out the percentage error in working out the value of gravity,g, from a pendulums motion.
i know that percentage error is (possible error/value used)*100 however I am using multiple values multiple times and its getting a little confusing.
In the investigation g=k(∆T²/∆L), my...
I am having a problem with some thermodynamics calculations. I am not very experienced with them and it certainly shows in my frustration with them! Anyway the check that I am using is incrementally simulated work compared to theoretical energy in.
Example 31KJ in 133KJ mechanical work out. I...
[SOLVED] Force Calculations
If an object is being pushed horizontally, does Fnormal always equal Fg? And Ffriction only equals Fapplied if it's at a constant velocity? I think that's how it goes, but I'm a little unsure.
Thanks!
According to the attached picture, is it theoretically possible to measure the G-Force pulled in A and B (taking that A and B are at respectively the very top and the very bottom of the box)? If it is possible, what would be the formula ( I don't want the answer, because it is all hypothetical...
Help please!
Here's the question I'm having problems with:
The solubility product of calcium hydroxide, Ca(OH)2, is 7.9 x 10^-6 at 25 degrees celcius. Will a precipitate form when 100mL of 0.10 mol/L of CaCl2 solution and 50.0 mL of 0.070 mol/L of NaOH solution are combined?
Do I...
I'm having problem knowing how to work out this question, can anyone point me in the correct direction.
Question
14mm diameter steel rod carries a load of 3.08kN in tension. calculate the stress.?
I ended up with this:
Stress = Force/Area.
Stress = 3.08/154 = Answer = 0.02N/mm²
if...
any CASTEP users or DFT planewave-pseudopotential method users out there?
how do I ensure that the basis set is adequate? I'm performing calculations with a rather
large unit cell ( orthorhombic, 8 atoms/cell) of a compound AB.
Can I justify my choice of energy-cutoff by testing...
Hi Everyone...
I really want to be able to calculate the RA/DEC of a Satellite from TLE data. For example, the International Space Station (ISS)
Can anyone help to point me in the direction of where to find the claculations I need to perform this conversion from TLE data to RA/DEC?
I...
I am trying to imitate the Airhog zero gravity climber
one of these
http://www.gmhummer.com/forums/showthread.php?t=111
can someone please help me regarding derieving equations for the suction pressure required and regarding selection of motors for driving suction fans.
the toy...
Homework Statement
Buffer solution : CH_3COOH (55 mL) + CH_3COONa (45 mL)
Ka (CH_3COOH) = 1.76 x 10^-5
Calculate the expected pH of your buffer solution after it has been dilted by making 10 mL of buffer up to 100 mL with deionized water.
Homework Equations
Ice charts
n= c x v
c= n/v...
AirFlow Calculations/ Anemometer anyone??
Hello all,
I am trying to solve a problem with my anemometer. I am not sure if there is anyone here that has used one but here goes. My purpose is to calculate CFM of a particular AIR INTAKE of my truck. The problems lies in that CFM= Air Velocity...
Homework Statement
An object is magnified, by a factor; of 5, in a concave mirror. The mirror has a focal length of 20cm.
Calculate ALL possible positions of the object.
Homework Equations
M=Hi/Ho=Di/Do
M=V/U
1/F=1/V+1/U
The Attempt at a Solution
1/20=1/V + 1/U
-1U=20V/V
U=-20...
Hi
Homework Statement
I have been on some statistics and I am not sure that I am on the right track
Given two meassurement zones of radioactive vast:
\left(\begin{array}{cc} zone 1 & zone 2 \\ 55 & 55 \\ 44 & 24 \\ 47 & 57 \\ 61 & 37 \\ 15 & 51 \\ 36 & 33 \\ 29 & 39 \\ 69 & 11 \\ 8 & 42 \\...
Dear all
I need to fix motor capacity for general mechanical components drive apllications
These type of calculation sites if available pl send me the details I cannot find that ones
Any reference books pl.forward me
(I referred shigley.general mechanical design books but i can't...
I have trouble figuring out how my textbook came up with the totals and am looking for step by step help. Here is what the text shows.
Z = R + j0 = R = 56 Ohm (in rectangular form [XL = 0])
Z = R < 0 degrees = 56 < 0 degrees Ohm (in polar form)
Z = 0 + jXL = j100 Ohm (in rectangular form...
HI all,
I am interested in designing a tapered bearing. Can anyone please let me know the parameters to be considered in order to design. I have been given a load acting on the sleeve, and the arae available to fit the bearing.
If any useful site which talks about bearing and its...
Hi-
We're thinking of purchasing Gaussian 03 for electronic structure calculations. I think the basic license only allows for it to be run on a single processor. Can anyone recommend a decent desktop <1500 dollars that will do a decent job at running electronic-structure?
I suspect that...
"Back of envelope calculations" for thurst, specific impulse, etc.
I am working on a project that is really out of my realm of experience, so if you could give me some basics, that would be much appreciated.
How do you determine the amount of thrust, power, etc. needed to travel a distance of...
Homework Statement
*How many moles of LiH are required to make 1 mole of LiAlH4?
* 6 moles of LiH will produce how many moles of LiAlH4?
Can someone help me get started on these?
Would anyone help me understand how did the ancient Greeks managed to calculate the earth’s circumference using knowledge of the angle of elevation of the Sun. I wonder if they had any means of magnification such as lens. They did make some pretty accurate conclusions for the limited technology...
So I'm in an intro quantum physics course, and while I'm sure this is a really simple problem, I'm just not getting the math to work out here.
Say you excite the atoms of some gas such that they emit light at a wavelength of 5500 angstroms as they fall back to the ground state. Now if the...
"Quick Calculations" by Shi Fengshou in English?
I'm looking for an English manual to "Shi Fengshou Rapid Calculations." Apparently the guy wrote a book in Chinese sometime between 1970 and 1980 called "Quick Calculations." However, I haven't been able to find an English translation of it. I...
Two identical, oppositely-charged, conducting plates of area 2.50cm² are separated by a dielectric 1.80 mm thick, with a dielectric constant of 3.60. The resultant electric field in the dielectric is 1.2*10^6 V/m.
a)Compute the charge per unit area on the conducting plate.
b)Compute the...
Homework Statement
Lab: rub each of a set of hard materials against a set of soft materials. Hold the hard materials near a suspended, negatively charged comb (wool rubbed) to determine the charge polarity and strength on the hard item. Create a list of the hard and soft items used in order...
Homework Statement
The given data is the perigee altitude r_p, the apogee altitude r_a and the period T. Mission: find the altitude 30 min after perigee passage.
Homework Equations
Semi-major axis a is calculated.
Kepler's equation gives a relation for the eccentric anomaly E:
E -...
I have been working on experimental heterogeneous catalysis for a couple of years, specifically with metal oxides. I would like to learn computational modeling on heterogeneous catalysis (e.g hydrogen abstraction on acetone). I actually have no background on computaional calculations. What...
I just want to make sure my logic is correct.
Hot coffee in a vacuum flask (thermos) is an example of what type of sytem?
Choices:
Closed
Open
Isolated
I thought it was closed system because the coffee is not interacting with the surroundings. But one of my classmates said he...
I'm a 3D artist and I'm making an animation that involves a free falling object. I know that, in a vacuum at least, an object will fall 32 feet during the first second; during the second second it'll fall 64 feet -- a total of 96 feet after only two seconds of free falling. The problem is that...
Homework Statement
My results are coming out funny and I was wondering if I was doing something wrong.
I have to find acceleration due to gravity.
one of my values ...
m2 (decending mass) = 60g
m1(ascending mass)= 50g
distance traveled= 95.3cm or .953m
time traveled average=...
Homework Statement
http://www.tunerspec.ca/school/3dvector.jpg
Homework Equations
c^{2} = a^{2} + b^{2} - 2ab \times cos \alpha
\frac{sin a}{a} = \frac{sin b}{b}
The Attempt at a Solution
I really don't know where to get started... I don't want someone to just do it for me - just...
Homework Statement
A rocket on its launch pad has a mass of 20,000kg. The engine fires at t=0s and produces a constant force of 500,000 N straight up. The engines fire for 1 minute during which the entire 10,000kg of fuel on poard is consumed and expelled from the rocket at a constant rate...
Can a hollow cylinder of known radius, height and charge be treated as a line of charge if one is trying to find the E-field at an arbitrary perpendicular distance from the center of the flat surface?
Hi all,
I have a problem with respect to axial strain.As far as I know the axial strain is calculated by using the formula given below.
Strain=(L-Lo)/Lo
where Lo : Orginal length and L : current length.
However, another formula is written in one of the program manuals I have been...
[SOLVED] Power plant
Hi! Here i have a problem : A power plant generates 400 MW of electric power.It has an effieciency of 40%.
a) At what rate does it dissipate heat?
b)If the waste heat is carried away by a river, and the temperature rise of the river must not exceed 3°C, what flow rate is...
Homework Statement
I have a physics project in which I need to find a relationship between the distances from each side of the throwing arm of a trebuchet and the actual throwing distances. Let's call the distance from the counter-weight side of the throwing arm to the axle variable 'A'...
Homework Statement
A point source of sound emits energy equally in all directions at a constant rate and a person 8m from the source listens. After a while, the intensity of the source is halved. If the person wishes the sound to be seem as loud as before, how far should he be now...
This is an actual real-life problem. There is a machine that winds film at my work. I need to determine the torque required (T_2) and force needed (N) for the conditions showed in my diagram when all variables except F_T2 are known.
Roll #2 begins with no film and ends as a large roll with...
Dear Physics Forums members,
The Maxwell-Boltzmann Distribution curves (obtained by calculation) allow one to statistically calculate the distribution of energies of molecules among a solution or mixture. My question relates strongly to Physics, Chemistry and Mathematics, however the...
I'm not sure if this is the right forum for this topic, so apologies if I got it wrong.
I've been reading the Feynman Lectures on Physics. In it, Feynman states that though Quantum Electrodynamics is highly successful, it is still extremely difficult to evaluate the equations to obtain a...
Dear experts,
I'm trying to get an equation for tilt angle into a MPU. This is no problem if you can find the equation.
The ADXL103 data sheet is indeed mysterious in that it is about a chip that measures acceleration. and yet gives no formula for the relation between...
Hello people...could u help me pls...coz i am rly stuck in these thing like calculations...i know all right answers but i am not too sure how to get them...please if somebody of us has a few minutes could u help me with that?
Thank you very much.
Azides are compounds of nitrogen , used...
Hello All,
I'm doing some fun at home experiments with my 1:6 scale RC car and I
wanted do some camparisons with its full scale counter part.
Mainly how jumping the two off a ramp (Duke's of Hazzard style).
I wanted to know if you can help me with confirming some of my scaling...
What is the benefit of using unit vectors rather than not using them??
I am not seeing the point of them? It seems to me that you can do the same calcs without adding the ihat and jhat.
Can someone explain exacly how and why unit vectors make vector calcs easier, or why we need them. Thanks...
I am in the middle of physics debate with someone who has some rather, shall we say, unconventional views regarding classic mechanical physics. It started when he posted that he feels 9/11 was a conspiracy because a section of a building falling does not increase the "load" (as he called it) on...