Loss Definition and 841 Threads

Hi all, I'm sorry if this is an inappropriate question. I have built a basement swimming pool for my wife. Unfortunately I neglected to insulate outside the concrete and insulating inside the concrete has caused some construction issues so I am trying to work out the heat loss if I go ahead...

Project : a solar panel powered LED light (with built-in storage battery) with the house facing north (in Canada). Story : The kit is bought at Costco. The solar panel is small (but it provided a 20 ft cable) and separate from the battery and light. The light (motion and light activated) is...

Hello guys can someone please explain to me how to use the assertion, "without any loss of generality assume...", i find it kind of tricky to use...a simple example would be useful too. :)

Hi there! I am currently building a simulation to model the propagation of radio waves in seawater in terms of its propagation loss. I have previously discussed the models I've looked at but have settled on a model which depends primarily on the propagation distance ##r##, the carrier wave...

Homework Statement This is a mining engineering question, but the section I need help with is more general: I am working through a long question regarding a given mine. In previous sections of this question, I have selected equipment based on required machinery outputs etc. I have now come to...

Homework Statement A box-shaped house has a square floor. Three times as much heat per square foot is lost through the roof as through the walls, but no heat is lost through the floor. If the house encloses 1500 cubic feet, then find the area of the floor that minimizes heat loss. Homework...

This is mainly just a theoretical question: say you have a rectangular box made of styrofoam (one of those ice cooler things) and it is levitating in air at room temperature conditions. It also has one hole at the top of the container so that heat can get out of it. Inside the box is a lightbulb...

Hi guys, I have quick question about calculating the power lost in fluid flow. So imagine there is a simple setup as in the attached image, where you know the mass flow in and out, pressures at inlet and outlet and the temperature at the inlet. Is the equation to find the power lost or...

Hello I am wondering how can I make sure that every number which I am losing will be different? I am using the following code: program lottery implicit none real(kind=4) :: x real(kind=8) :: y integer :: i, seed= 64256 call srand(seed) do i=1,6 x=rand() ! to make the lossing interval...

Homework Statement A ball bounces down a uniform flight of stairs of height H , rising after each bounce to to the level h of the previous stair . the velocity of the ball before the impact is equal in all the impacts . what is the average power of energy loss ? Homework EquationsThe...

Hi everyone; How I can define the minor loss coefficient(pressure loss) of a filter which has 60nm pore diameter?

Homework Statement I would like to define pressure loses through transmission line to the transducer. In transmission line I have a reducing union, filter and L pipe. How I can find this differences? In case of frequency my reducing union reduce pipe diameter 6 mm to 3 mm how i can determine...

Hello. I 'm looking for a line amplifier schematics working around 1.5 GHz to compensate coaxial ( RG59/CU) loss behind a L.N.A

I was having a discussion with a friend, and my side of the argument was that for solar to work you also need a lot of fossil fuel running in the back ground just during the day, making it very expensive. Let's take New york as an example. Let's assume they have enough solar panels to produce...

Today, I discussed my friend about two rigid beams impact and assuming no energy loss in the impaction. As in the above figure, the upper beam move down with a uniform velocity ##v_c##, and hit a beam with ##0## velocity. After that the above beam will rotate and move away, which can be...

Homework Statement Homework Equations GPE=mgh The Attempt at a Solution I don't understand why the answer is B. My approach is assigning h a random value, say 10m. When the depths of water in both vessels are equal, the height is 5m. Therefore, since the mass of water in both vessels are...

Homework Statement If 39.4 kW of power is to be transmitted from a generating station over two 0.141-Ω lines, estimate how much power is saved if the voltage is stepped up from 120 V(rms) to 1200 V(rms) and then down again, rather than simply transmitting at 120 V. Assume the transformers are...

Ok I do not know if I am right about this but : if you have an AC 120 V 60Hz generator connected to a wire of Length L(1000KM) and Resistance R going to a motor down a well, to know if you will have Voltage loss you do λ = C / F C is the speed of Light = 299 792 458 m/s F is the 60Hz λ =...

People jog, thereby expending energy, and lose weight because of it. As modern people who understand mass energy equivalence, we know (or can presume) that during the process of running, the body derives its kinetic energy by breaking down ATP in the cells. When this breakdown occurs, the total...

Hello All, I am an electrical engineer and hence quite far away from mechanics of masses. I just came to know that a spacecraft got crazy and might fall on earth. I did a simple math using MATLAB considering no atmosphere with h and m of the object as input and Nagasaki Bomb scale energy...

So in designing closed systems, mostly heating systems, I realized today that I've probably been doing one thing wrong all these years. In such a system one doesn't take elevation loss due to gravity into account since you "get it back" on the way down. This I've always been aware of, but what...

Hey guys Don't know if this is posted in the right category. doing an technical report on industrial gas turbines. but i am kind of lost. Does anyone have any input to what we can write about? I'm thinking of any problems with the turbines that we can write about. What heat loss and how much...

I want to know more about hair loss issue. The basic idea to stop hair loss by knowing the main cause of hair loss. Also provide some valid hair loss treatment available in the market

Homework Statement 2. Homework Equations [/B] I am trying to prove the equation $$ \frac{\bar{P}}{V}=\frac{1}{2}E_0^2\sigma_{AC} $$ which can be rewritten as $$ \begin{align} \frac{\bar{P}}{V} &= \frac{1}{2}E_0^2\sigma_{AC}\\ &=\frac{1}{2}E_0^2\ \omega\ \epsilon_0\ \epsilon^{''}_r\\...

Hey everyone, This is quite a simple question, I think I'm just getting confused. 1. Homework Statement Given Data: Merlin: Resistance: 2 Ω / km, Maximum Current: 519 Pelican: Resistance: 1.5Ω/km, Maximum Current: 646 Penguin: Resistance: 4 Ω/km, Maximum Current: 357 Sparrow: Resistance...

Hi, I just have a few questions on bernoullis equation dealing with power and head loss If the equation for power is p = mass flow rate * g * Hloss, Then is g only used when let's say a pipe is at an elevation ?, because in my book I have an example where g is not used to calculate the power...

We all know that the system loss in transmission line is i^2R. So, in order to reduce the loss we diminish the current flow through the line by means of transformer. My question is i can also calculate system loss by the formula v^2/R where v is the potential across transmission line. So...

I do not know what area of the forum my question belongs in and I am not sure how to phrase it correctly so it will be understandable but I will do my best. At some point in time will the energy of all particles deteriorate to nothing (assuming an expanding universe) and if so how will it...

So according to the ideal voltage loss equation V = IR if I double I (per se) I will double the loss in voltage. This is a bit odd and I just want to make sure my intuitive explanation is correct. I am assuming voltage loss is mainly due to some electrons bouncing off the resisting material and...

Good day. Help me with a formula/equation to calculate water loss in broken pipes, e.g. a 63mm PVC pipe broken and spilling water.

Hello Engineers, while simulating transformer core losses in transient Maxwell sollution, I have got an error: Current leak to the air. does anyone ahev idea to solve this problem Thank you

What is the value of linear loss coefficient in Si waveguide for light of 1550 nm?

Hello To calculate the heat loss of a fridge, do I need to take the surface area of the in- or outside of the fridge? Heat loss formula = k * delta T * A k = heat transmission coefficient A = surface area

All I can find on google is about what the dielectric loss angle is. I imagine the bridge is something like a Whitstone bridge but for this... Thanks

Is there a general or approximative equation for the loss of mass, of a meteorite as it travels through the atmosphere? For example as a function of something like its speed, surface area, the drag force experienced by the meteorite.

Hey guys, Im currently looking for a way to calculate the energy loss of a particle in a gas. This will help me to understand deposition processes better. The particles I am looking at are heavy, uncharged ones (e.g. metal atoms). Stopping power is not a viable concept without charge, and Bethe...

Hello, After researching on many kinds of confinement methods and most promising reactions, (aneutronic fusion etc.) I saw almost every paper complained about radiation losses as the greatest problem preventing net power gain. And except Tri-Alpha Energy and LPP (Dense Plasma Focus) companies...

Homework Statement After a lot of searching I can't seem to find a way to solve this. Basically, for a bouncing ball, if I know the dropped height and rebound height in a vacuum. How do I calculate the elasticity between the ball and the floor? Homework Equations K = 1/2 mv2 The Attempt at a...

<< Moderator note: This thread is missing the homework template due to originally being posted in another forum. >> hello everyone, this is my first post and I am looking for some help. in my lab we did an experiment to calculate specific heat values for various metals using a calorimeter. the...

So I have calculated Sin(70°) = Opp / 30.816, in this equation Opp = 28.95757 BUT when I do Sin(X) = 28.95757 / 30.816 I result in 1.08422336464 when converted to degrees gives me 62.12° NOT 70° If I put Opp (a) (28.95757) and Hypotenuse of (30.816) into the following calculator it says 70°...

Dear all, I have inquiries about the Bohr's calculation for energy loss of charged particles. These inquires are from the "Techniques for Nuclear and Particle Physics Experiments" (W.Leo). On page 23 of this book, it is written that: the the interaction time is t = b/(γv), with b is the...

I tried using $\frac{1}{13}$ x 30 + $\frac{12}{13}$ x $\frac{47}{51}$ x -10 but it didnt work.

Homework Statement what is the energy loss of the damped oscillator. Homework Equations x(t) = A*e^(-Bt)*cos(w1*t) T = 1/2 mv^2 The Attempt at a Solution To solve for an undamped oscillator, I took the derivative of the equation of motion x(t) and plugged the amplitude into 1/2 mv^2 equation...

History lesson from BIG BROTHER to little brother: What goes around comes around. :mad: MICHIGAN: GO BLUE Chet

How do you calculate how much delta v is lost from gravity and atmospheric drag? I've been looking for days but I can't find anything that actually tells me how it's calculated. For example it takes 1.5 km/s - 2 km/s extra delta v for a low Earth orbit because of drag loss, how was that number...

How much the dielectric loss tangent of 10 nm thick SiO2 at 1Ghz ? I am studying the MOSFETs i want to know the the dielectric loss tangent of SiO2 dielectric at such manometer thickness, So if anybody know any reference about it Please let me know..

Homework Statement from the physics fact in the photo, i know that the daughter nucleus is a positive ion... but , referring to the part 2 , finding the mass loss in beta decay in terms of atomic mass , it says that A_(z+1) Y has extra one orbitting electron comapred to the parent nucleus. this...

Homework Statement Two particles are in a perfectly inelastic collision with no external force acting on them. Particle 1 has m1 and v1>0. Particle 2 has mass m2 and v2<0. Find the loss in kinetic energy after the collision. Express your answer in reduced mass as well as relative velocity...

Is there a formula covering this? (not including free fall/gravity) I have the drag coefficient, velocity and every other variable I think I would need for the object in particular.

Dear all, I am reading the "Techniques for Nuclear and Particle Physics Experiments" of W.R.Leo. I am confused when reading the section 2.2. Energy Loss of Heavy Charged Particles in Atomic Collisions (page 21). At the beginning of the second paragraph (from the bottom up), it is written that...