Calculation Definition and 1000 Threads

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.

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...

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?

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)...

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?

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...

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...

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)...

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...

< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown >[/color] 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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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

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)

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...

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) =...

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...

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...

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...

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 =...

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...

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...

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...

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...

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!

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...

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...

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...

<<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...

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...

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...

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

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...

Hello, I have a few questions for calculating heat tranmission between materials ( i need some formulas and tips). First of all i need to find out how much energy a water pipe transmit to the concrete where it is in. I couldn't find a formula for this one. Then the concrete should store some...

I hope this is the right place for this... Question #1. How much can the human body stand multiple rapid G-force changes. Like let's say I made a vehicle that you could make sure all your body parts were 100% secured and it could move freely in space in any direction what would be the result of...

Homework Statement A cannon has to fire a ball through a window in the wall. The window is 10 meters at the Y axis, and 8 meters (away from the cannon) at the X axis. The window is just slightly bigger than the ball (let's suppose that the dimensions are negligible). Find the required launching...

Okay I have a question involving calculating the FFT of a signal from a sensor. I have simulated many different scenarios in MATLAB of various noise characteristics involving the signal. I want to take the FFT of a noisy signal. As long as my expected input signal has a higher amplitude than...

Hello, I need to find the angular velocity using Schwarzschild metric. At first I wrote the metric in general form and omitted the co-latitude: ds2=T*dt2+R*dr2+Φ*dφ2 and wrote a Lagrangian over t variable: L = √(T+R*(dr/dt)2+Φ*(dφ/dt)2) now I can use the Euler–Lagrange equations for φ...

Hi, I need your help. Is my calculation correct? 1. Homework Statement We have to build a launcher that will be able to reach a target that is place anywhere in a prism 3m X 3m X 1m. The launcher have to used a golf ball and gravity as source of energy. I am trying to calculate what we need...

I'm still confuse on using the equation about atomic scattering factor, f = a*e^(-b+((sin(theta)/lamda)^2) + c (general equation), where sin(theta)/lamda = 1/2d = 1/(2*(sqrt(a^2/(h^2 + k^2 +l^2)))), so this term is dependent on the plane. which you will used to find the Intensity of crystals...