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.
This question is confusing me, trying to find an equation for "tensile force" has left me confused since I've found no equation for it just for tension, tensile stress and tensile strain, just wanting to make sure I've not missed anything or done it incorrectly
1. Homework Statement
At a...
Hi folks,
I'm working on Fluka nowadays which you can found from here if you are not familiar. It's a very useful and widely used Monte Carlo simulation package.
My main goal is to be able to perform total cross section calculation with it. So far, please consider I'm a rookie, I've done some...
Hi everyone,
Homework Statement
In the picture in attachment you can see 2 objects: "1" (it would be a door keeper) is able to move in direction "Y", "2" (it would be a lock latchbolt) is able to rotate around its axis. The 2 objects are in contact with each other. On the object "1" we have a...
I know two formulas which is to do with change in temperature,first one is : Q=mc(T-t) and the second one is
E=sigmaT^4. My question is the difference between these two and where we have to use either of these?
Hello,
I'm a student in mechanical engineering and right now, we're studying non Linear Calculation of Structures. We have a project which consists on evaluating one of the solutions to stop a tourism aeroplane CESSNA 172, like a cable to stop it when it lands. So we started our study with a...
Homework Statement
y'' + 3y' + 2y = r(t),
r(t) = u(t - 1) - u(t - 2),
y(0) = y'(0) = 0.
I need to solve this by convolution, which I know is commutative. The problem is that my calculation gives (f * g) =/= (g * f). Could someone please tell me where my mistake is?
Homework Equations...
Hi,
I have a question how to calculate the light emitted from a LED screen. The LED display is rated at 5000 nits. Total size of the display is 64sqm. (8m x 8m touching the floor) I would like to calculate the total light emitted, the light on the floor in front 1m away and the light on the...
Homework Statement
A man is jumping up and down on a pogo stick. For the purpose of this
problem, we will think of such a stick as being a (massless) spring with a guy
+ stick on top. We will assume that no friction is involved, and so in principle
the guy could keep jumping forever. At...
Homework Statement
I have two analog MEMS accelerometers ADXL337, ADXL377. The ADXL337 can measure acceleration upto +/- 3g (where g = gravitational acceleration) and ADXL377 can measure upto acceleration of +/- 200g. More than this much amount of acceleration, would create noise and random...
Homework Statement
Muscle can be torn apart by a force of 100,000 N applied across an area of 1 m2. A 10 cm2 muscle therefore will be torn by a force of 100 N.
If a student of average size were being lowered into a black hole of 1 solar mass, at about what distance from the hole's center will...
Firstly, I'm new to these forums, and I'm not sure what the prefixe in creating this thread is supposed to be... (i'm assuming it is to judge to question's level)? saw some threads without prefixes but i can't post one without... maybe i missed a stickied thread or a readme?
Alright, so, first...
Hello,
I am new to this forum but I have a question for you all. It is about the pressure in a system that changes when leakage changes. The test setup has to following components:
- Air supply with 8-10 bar
- Pressure valve that can be manually adjusted
- A flow meter that measures the...
Homework Statement
A spaceship with mass m = 800 kg moves freely in gravitionalfree zone. It moves with a constant velocity v = 1.5 km/s for t < 0. At t = 0 the spaceship is starting to break using a rocket acting on it with a time dependent force F(t) = Bt (T-t), where B is a positive...
#1 Round and round we go! You are constructing a centrifuge to use its spinning motion to act like increased gravity.
(a) Find the formula for centripetal force.
(b) Your centrifuge can spin at 35,000 rpms and your samples are placed 1.75 inches from the center of rotation. If the force of...
Hi, this may be a very trivial question but,
When calculating energy, is it BE(products) - BE(reactants) or is it the other way round?
I have been solving questions and the solutions were products - reactants for some and reactants - products for some.
Also for mass defect , is it mass (...
Hey,
I am attempting to figure out the optimal nozzle placement for an evaporative cooling tower. Now, calculating the theoretical coverage of each nozzle is obviously not a problem since I know the spray angle of the nozzles. However, since the water is injected at a much higher speed than...
Homework Statement
Consider a point charge Q placed at point O.Consider any point p in the field of the Q.Charge q is placed at point p.Charge q is then moved from point p to s the distance i=between p and s is dr.Calculate work done.
y
Homework Equations
##dW=##-##F^→.dr^→##
The Attempt at a...
An airplane takes off and flies 245 km on a course of 45.0° south of west and then
changes direction and flies 175 km due south, where it lands. Find the displacement
from its starting point to its landing point.
I have literally no idea how to approach this, I worked with physics only...
Hello all,
My robotics club at school will be entering the VEX Nothing But Net competition. We are beginning to design the robot and it's launcher specifically.
We want our flywheel design to be two wheels on each side, on a horizontal line like this. We would squeeze the balls between the...
I built a spreadsheet to determine the flow and everything through a pump. I won't get involved with the first part just assume it to be correct and the gallon per hour/minute calculations are correct...
Hi. I have problem simulating this circuit in Multisim:
(LTSpice)
Here is scheme from Multisim:
When I run transient analysis, I got this:
------ Checking SPICE netlist for Design3 - Saturday, September 26, 2015, 10:58:03 AM ------
======= SPICE Netlist check completed, 0 error(s), 0...
Homework Statement
Jack decides to create his own temperature scale. He places an uncalibrated mercury thermometer into an ice-water bath and records the mercury level as 20.0S. He then places the same thermometer above boiling water and records the mercury level as 170S. Finally, he divides...
Hi. Can somebody make a calculation for me?
how strong do a magnet need to be to lift a mass of 75 kg iron 1 meter straigth up in 1 second.
Best Regards morten
I am trying to solve the following problem for my graduate course in isotope geochemistry. If 1 g of 226Ra is separated from its decay products and then placed in a vessel, how much helium (cm3) will accumulate in the vessel in 60 days?
Here is what I know. The decay series from 226Ra to Lead...
Homework Statement
Find the limit \lim\limits_{t\to -1}\frac{\sqrt[3]{t}+1}{\sqrt[5]{t}+1}. Needless to say: No L'Hopital's rule, otherwise this thread would not exist.
Homework EquationsThe Attempt at a Solution
Have tried multiplying the fraction such that I get the difference of squares in...
hello.
I have a ejection mold (steel) which has a bridge like mount which locates the handling eye bolts outward around hydraulic cylinders. I need to make sure the bolts in the bridge will not shear due to the sideways load when the mold is lifted or flipped 90degrees. Here is the known...
Hello folks, I need some physics help.
Some background to get us on the same rails :)
I am developing a 2D game in my spare time. Player controls an object (aka spaceship) in open space (no gravitation influence) by selecting a point in space. A constant force which is always pointed at the...
Hi
I am working on Bio Gas Project and I want to know calculations/Formulas to find out elements of Generator.
I am MBA students and i have to submit my project report with to start up new firm on renewable energy.
Please submit can share your knowledge to help me.
Homework Statement
an electric field is uniform,and in the positive x direction for positive x,and uniform with the same magnitude but in the negative x direction for negative x.it is given that vector E=200 I^ (N/C) for x>0 and vector E= -200 (N/C) for x<0 .A right circular cylinder of length...
Homework Statement
Water corresponds to approximately 20 vol.% of the bone in mammals. On a dry weight basis, approximately 70 wt.% of the bone is composed of carbonated apatite. The density of apatite is ~3.0 g/cm3. Density of dry collagens is ~ 1.2 g/cm3. Calculate the volume percentages of...
Hi everyone, I know this is a standard textbook question but I am really wondering whether I am wrong or not.
My solution is shown as below but can anybody please give me some opinion? Cause I think it is too simple for this question...Thank you so much.
Water corresponds to approximately 20...
Hello chaps,
I'm trying to calculate absorption coefficients of gases at moderate temperatures ie ranges in which diatomic gases (such as N2 orO2) are partially disassociated or ionised, therefore including molecular bands as well as continuum. Can anyone recommend some suitable reading...
Hello,
I am working on selection of motor for intermittent wrapping steel strip on a reel, intermittent because system is equipped with a sensor which triggers motor after the strip reaches a certain level in the buffer box and then motor stops when the level of strip falls below another fixed...
(Sorry if this is the wrong place for this question, I wasn't sure where to put it)
I've been running an experiment with rabbits, and am trying to figure out the error of my feed measurement.
I fed them using a 1/3 cup measure, and recorded the number of scoops they got. I estimated that the...
Can anyone verify or correct this equation to work out the crossover frequencies of a three tier sound system please? I never was the best in my physics classes...
(Please find attached "Crossover Freq.dpf")
And thank you in advance for your time.
Sorry about the way i have had to write...
Hi,
I am wondering how to calculate the resistance for the current running in radial direction starting from the center of a circle?
It seems there is a formula out there, and I would also like to know how to derive that formula..Thanks.
Hi,
I am not a mathematician or scientist or student. In advance I ask that you please excuse my ignorance. I calculated that at tensile strength of .51 equals an MPA of .0035163. Thank god for internet calculators. I do not know what MPA means, but materials are listed this way. So if I...
inb4 "google it", I did. There aren't a lot of information about this topic.
Can a Hot Water Rocket or a Steam rocket ever succeed to reach outer space?
I can calculate the exhaust velocity by determining the change in enthalpy I guess but I don't in which state will it exist in and how can I...
Hello guys,
I have problem to calculation pressure due to heated water in a closed tank.
1. Tank with full of water.
2. Tank with half of water.
Does anyone has idea?
Thanks a million.
Hi Everyone ,
Can anyone explain why I am getting negative result with a large Neodymium N35 ring Magnet ?
Br: Remanence field, independent of the magnet's geometry
z: Distance from a pole face on the symmetry axis
D: Thickness (or height) of the ring
Ra: Outside radius of the ring
Ri...
Homework Statement
A student is calculating the resistance of a piece of fuse wire. He takes 5 readings on the voltmeter and ammeter for different settings of a variable resistor.
He decides that instead of measuring the gradient of the graph to calculate the resistance, it would be okay to use...
Hello dear colleagues.
I am designing a pressure vessel according to EN 13445-3 pressure vessel code. As I have specified in the thread name I am interested in the required burst pressure calculation.
Before I start explaining my situation I would like to know if anybody has got any experience...
Trying to reverse-calculate an equation to achieve one of the original variables when not present.
1) You have a number... A (which is always a positive number)
2) A is multiplied by 1.75%
3) This result is then added to A, and the resulting sum being B, i.e. (A x 0.0175) + A = B
In my...
When I use E=mc2 to calc. the rest energy of an electron, I get .512Mev not .511Mev. I am using 9.109x10-31 kg for the rest mass of an electron and 2.9979x10^8 m/s for the speed of light in a vacuum.
Can anyone tell me why there ís a discrepancy between my results and the accepted answer?
Hello all,
This is the situation: a pipe, shown in de drawing below, is lifted at a constant speed of 1m/min. The pipe is closed at the top and open at the bottom. For obvious reasons, a ventilation hole is required at the top. The intention is to lift a minimum amount of water, in other words...
One of my hobbies is launching high altitude weather balloons carrying video cameras and scientific instruments to record various environmental parameters at high altitude — 90,000 to 100,000-feet.
I'm planning another project and I was wondering how much pressure is being exerted inside my...
Homework Statement
A typical inflated balloon has a mass of 4g. Two balloons are rubbed against wool, touched together and then suspended by someone holding the thread at its centre. It is found that the ballooons rest so that trheir centres are 42cm apart and that the thread encloses an angle...
Hi,
I'm new to PF so this is my first post. I have a real case scenario as my first thread in which I have a gravitational tensioning system that provides tension to a cable conveyor. The tensioning system includes a series of pulleys in a particular reeving arrangement that is fixed on one...
ΔG=ΔH-TΔSsystem and ΔSsystem=qp/T and isn't qp=ΔH? Which means ΔG=0 always which is obviously wrong.
But the derivation for Gibbs Free Energy is based on qsurrounding=-qsystem so shouldn't the term be equals to 0?
hi,
i have 8000 lb machine it has 4 wheels (just like car), i want it to move on 2 ft/sec speed on cast iron wheels with steel track at flat surface. radius of every wheel in 5 inch. what will be the torque required to move this machine?? and what will be the torque on each wheel?? i want to...