Calculations Definition and 982 Threads

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...

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...

guys can anyone help me out to complete my final year project by guiding me for the calculation of gearbox

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...

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?

Homework Statement 6. A 2.5-kg book slides horizontally and falls from a shelf 3.0m above the floor. How much work does the force of gravity do on the book as it falls 3.0m? F. 1.2 J G. 7.5 J H. 24.5 J J. 73.5 J 7. Which of the following is the minimum amount of work done by a...

I did an exercise today on my breadboard with an inductor that I made from a coil of 22 gauge stranded hookup wire wrapped in a helix coil around a 60d nail I found in my garage. The power source was a 9V battery. I took a measurement of just the battery fully open with my digital volt meter and...

Homework Statement Hi, I am answering Question #3, and using the formula and variables above scratch area as reference on how to answer the question. Could someone please have a look and see if the problem I worked out came out correct. Homework Equations The Attempt at a Solution First I...

I have to assess the sizing of a spindle of a DN600 Knife gate valve. The spindle is subjected to two sources of loading acting in both shear and tensile. •Torque applied to the spindle. •Resulting thrust from line pressure. Known data: Required thrust at 2 bar line pressure: F = 53.2 kN...

The Question A single phase transformer has the following rating: 120 kVA, 2000 V/100 V, 60 Hz with 1000 primary turns. Determine: (A) the secondary number of turns (B) the rated currents on the primary and secondary (C) The maximum flux (D) given a maximum flux density of 0.25 T, the...

This is totally pissing me off, I don't know what the heck am I doing wrong. Alright, so I was given a temperature of 30°C at 30% relative humidity. I have to get the absolute humidity- So I used Antoine; log(P)=7.96681-1668.21/(228+30); P = 31.6869mmHg. 0.3 x 31.6869 = 9.41517...

HI I'm making a sun follower with a pic, and I need the formulas to calculate the position of the sun, I need to calculate azimuth angle and zenith angle (Is that enough to know at any time the position of the sun?). Thanks

Dear all I am working on a project and I need to measure the surface roughness of a specific type of wood. I don't want to make things complicated because I have to make the instrument myself. I think an interferometer can help me to measure surface roughness but I really don't know how to...

Can you suggest any source available on internet which may be particularly helpful for those studying/brushing up knowledge of classical or quantum field theory without help of any teacher or friend? Some calculations are at first not so straightforward and there are many types of calculations...

Just some things I need to verify: When finding the x-bar of the function y=x3 using the equation: \bar{x} = \frac{∫\tilde{x}dm}{∫dm}, Is my \tilde{x} going to be the x distance(which will just be "x") times x3? Also, will x3 be in the denominator just before "dm"? The same process...

I am an EET student. The professor I have is not very thorough in his examples and if you can't keep up with him or have x-ray vision to see through him to the board while he is working the problems then you just don't get the information needed. That said, I am currently trying to do a take...

I would like to calculate the energy need for move in the black volume in gas (move in from r2 to r1), when gas is under rotating movement. The black volume turn at the same speed than gas. The weight of black volume is considered like 0. Like rotating create centripetal force, the pressure at...

For a physics project, a few friends and I got ahold of a couple of balls that would record the time of an impact. Using this, we wanted to calculate g using kinematics to see how off we would be from the expected 9.81 m/s^2. Obviously, differences in altitude, air resistance, and experimental...

Hello! I have a question about seat belt force. In a 55km/h collision maximum chest acceleration is 60 g, and if say torso weighs say 40kg, then max force should be 600 m/s^2 * 40kg, which equals a lot, but if you look at test data of seat belt force it is only 8KN which is strange, compared to...

I have a book on Gaussian but it mainly just explains how to use the program, it only gives very brief explanations of the theory behind how Gaussian does what it does. I want to gain an understanding of how Gaussian performs the various types of calculations that it can do. I understand the...

Homework Statement Without any calculation, explain why [(1 3 0)' (2 2 1)' (-1 0 1)' (1 -3 1)' ] is a linear dependent set. The Attempt at a Solution I used the theorem which states that the number of vectors in any linearly dependent set is greater than or equal to its dimension...

Hello, I have been looking for a decent electrical forum for quite some time now. Here is my problem. I own a service and rewind company where we rewind and service electrical motors. We also repair servo motors. A lot of times, due to bearing failure, the magnets on the rotor overheat and...

The only thing I know how on the basis of nuclear reactor design is how to run kcode in MCNP and see if my theoretical reactor is critical. How would I be able to calculate how the fuel is burning in my reactor over some period of time, and change my core composition accordingly?

Hi all, I am doing a project on Pick and Place system with 2 Servo based Axis control system. I am struggling in selecting the servo motor and torque calculation. My pick and place system consists of 2 Servo Rotary axis which indexes from 0 degree to 180 Degree with 1 Sec acceleration and...

Ok, I want to start by saying I have been out of this field for some time and I have regrettably lost a lot of my knowledge. So I may require a little patients, but here it goes. I am wanting to construct a micro motor. I was trying to decide on what materials to make the internal...

Homework Statement To purify osprase you must use 750 mL of an extraction buffer consisting of 0.500 M Tris, pH 7.8, 100 mM NaCl, 20% sucrose. You have the following chemicals available: Tris base (FW = 121.1 g/mol; pKa = 8.1) 1.00 M HCl NaCl (FW = 58.4 g/mol) Sucrose (FW = 342 g/mol)...