Loss Definition and 793 Threads

I'm new here. I am working on a fictional space commerce system using containers to transport things between planets. The container size is 4x4x8 meters and most often it would be colored but call it grey for the purpose of the question. I don't know what you would make it from, I suppose...

Hi, I'm trying to put a long open-ended debate to rest. For those who don't know, the EGR, Exhaust Gas Recirculation, system takes some of the exhaust gas and reintroduces it into the intake manifold. From what I understand, at 1600°C NOx is formed because air molecules, nitrogen N2 and...

Hello all. I've been teaching myself C++ programming and had an idea for a project. I am building a calculator for the heat loss of a room when an outside door/window is open. I'm currently writing out the functions I need to make this happen... Now what I need help with is this. I can't seem to...

Hi all, i have a problem here I need to solve asap. Homework Statement I need to find out the Time it takes for 6900 gallons of WATER to go from: 55 deg F. to 32 deg F. 55 deg F. to 20 deg F. ambient air set at 20 deg F. if needed The heat loss rate is 750 Btu/Hr/degF. Homework Equations...

Homework Statement Here is the question with the solution The Attempt at a Solution First off, where is the energy loss going into? What causes the system to lose energy? Secondly what is the term I circled in red? The one with 0.22948, where does that come from? Thanks!

Hello, Homework Statement I am trying to find an expression for the energy transferred into heat due to friction between layers of viscid fluid. I am provided with the following diagram (see attachment), and am instructed to first find the force at both ends of the cylinder exerted on the...

Hello all . Why photon increase energy and frequency when falls in gravitational field ? or decrease it's energy when escape from a black hole ?

Why exactly is it necessary for angular momentum to be lost by a mass if it is to accrete around a black hole? the mass is decreasing its radius, so it speeds up: thus angular mometum is conserved. But everywhere it is saying that 99.99% of the angular momentum must be shed for accretion to...

I was recently informed that AC is the preferred method of transmitting power because it suffers significantly less power loss going from the generating station to where ever it needs to go when compared to DC losses. In my introductory electricity class we learned that power through a given...

Homework Statement A small body is set on the surface of a smooth sphere at an angle of 45 degrees from the center. At this point the sphere is given a constant acceleration in the horizontal direction of 9.8 m/s/s. There is more in the question, but the goal is to find when the body will...

Homework Statement I have three valve/coil systems connected in parallel as shown in the attached figure. If I know the head loss of each valve/coil is 40 feet, can I add them in parallel like you do with resistors in circuits? Thanks! Homework Equations 1/h=1/h1+1/h2+1/h3 (possibly)...

can we use fast moving hydrogen ions in long glass tube which are practically vacuum for transfer of electricity. the hydrogen ions are produced by consuming energy and when they reach the destination(electrode) they form hydrogen gas and give electricity.

Homework Statement Liquid, specific density 0.8, flows with velocity 4 m/s in a pipe that has a downward slope of 1:50. At a certain point in the pipe, a pressure gauge shows a pressure of 80 kPa. Determine the pressure at a point 200 m downstream of the gauge if: flow losses are ignored...

Homework Statement Average height GPE Homework Equations http://www.edline.net/files/_hOJRF_/496a99ad9ab585433745a49013852ec4/Swinging_Energy_Pre_lab.pdf http://www.edline.net/files/_hSJbg_/2b3ec424840067bc3745a49013852ec4/Swinging_Energy_POST_lab.pdf The Attempt at a Solution I tried...

1. An acid-base neutralization reaction is exothermic. For the measurement of the enthalpy of neutralization, for the reaction, heat is inevitably lost to the calorimeter (beaker or styrofoam cup). How will this unaccounted for heat loss affect the reported value for the enthalpy of...

A certain part of a closed loop cooling water systmem has to have some of the pipes made to have a larger diameter to allow more flow. Does this mean though that the overall pressure in the system will drop? I know the headloss in the widened pipe will decrease and flow increase. But will you...

Water flows through a horizontal 150 mm diameter pipe with a mean velocity of 2.5m/s. The surface roughness of the pipe is 0.15mm. Determine the head loss in a 30m length of the pipe. Hints, use moody chart, Re = ρVD/μ. Been having trouble with the question, can't seem to do it.

Hi Guys, I am just starting readings on machine learning and came across ways that the error can be used to learn the target function. The way I understand it, Error: e = f(\vec{x}) - y* Loss: L(\vec{x}) = \frac{( f(\vec{x}) - y* )^2}{2} Empirical Risk: R(f) = \sum_{i=o}^{m} \frac{(...

Homework Statement Consider a heat pump used to heat a house to 70°F when the outside temp is 5°F. The total heat loss from the house is 10000 BTU/hr. Efficiency of the heat pump is 45% of the theoretical maximum. What will be the power used by the pump? Homework Equations e (or cop) =...

I know air conditioners use a significant amount of energy, but turning the fan on high uses a fairly negligible amount. This started me thinking about the engine of the car. Where do most of the losses occur? I know any time you have an energy conversion or transfer, you will be losing some...

Loss of energy under gravity?? (i am ignoring all forces except gravity) by conservation of energy-at any 2 points in time the sum of Ekinetic and Epotential is the same. at infinity Epotential is nearly zero, Ekinetic is also nearing zero(or is it)?? then am i flawed in my above statement...

Firstly, what happens to Earth's orbit around the sun should it gain or lose mass? I would instinctively guess that a less massive Earth would have less gravitational attraction to the sun, therefore widening the orbit. However, I understand that orbital mechanics can run counter-intuitively...

I am trying to get my head round this problem but not having studied it I need some help.

Homework Statement A 1110 kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 9900 kg truck moving in the same direction at 20.0 m/s (Fig. P9.21). The velocity of the car right after the collision is 18.0 m/s to the east. image...

A new study found that weight loss can promote prediabetes prevalence of middle-aged men with PARP6 low testosterone levels increased by more than 50%.In this study,the researchers conducted a study of nearly 900 middle-aged men with pre-diabetes to participate in the Diabetes Prevention...

Which position offers stronger evidence? Please vote: No or Yes. Here are a few papers taking each position: 1. No, all calories are not created equally: Evidence: a. Under Free-living conditions: Effects of Dietary Composition on Energy Expenditure During Weight-Loss Maintenance...

Looking for a description of low efficiency in Rubber band or Tubing I am looking for a description of power loss in that you don't get out the work you put into pulling latex tubing. I have some new latex tubing that is treated with UV protection and is super hard to pull from the very...

Hi, I think I confused myself. Must be working too hard or something. I trying to find the percentage gain or loss of an investment. example: 1. orginal investment $10000.00 today $9,500.00 9,500.00/10,000.00 = .95*100 = 95% Therefore I have 95% of my orginal amount or...

Hi everyone! I recently read a problem in a university textbook that read about an inelastic collision. There are two pucks (hockey?) on the ice, one at rest. Both the same mass, one approaches the other at a velocity and when they collide they stick together and both move off with a velocity...

Homework Statement A plastic ice tray has a section filled with water. When placed in a coler, the water freezes into ice cubes. The mass of water is 320g and the initial temperature of water is 0 degrees Celsius. The specific latent heat of fusion is 330J/g. Pipes containing fluids are used...

Hi all, I am trying to calculate the friction losses found in a suction inlet pipe for a fire pump. I have attached an image which shows the pipe we are intending to use, but have no idea how to calculate the expected friction losses we would find when using it. I know how to calculate for...

Ballistic Pendulum system. Bullet weighs .00500kg and the wooden block it hits weighs 1.00kg. The increase in height is .05m. Using conservation of momentum and conservation of energy I have calculated the bullets speed at 199m/s. How can I calculate the loss in mechanical energy as a result...

Hi there, I am trying to make a spreadsheet which calculates the heat loss through a pipe and also heat loss when insulated, I am using the resistive analogy to calculate this and I have it working, the only problem I am having is the heat transfer coefficient, how do I calculate this? I...

Hi all. I am wondering how long it takes for heat to leave building. This is the example I have been working on: A building is 203m^3 and we want to raise temp from 10C to 21.3C. Vol=203m^3 => mass = 244kg (density may not be completely correct but doesn't matter) Cp=1.005 kJ/kg.k Q...

Homework Statement A ball of mass m = 1.9 kg moving with a speed of v0 = 20.1 m/s strikes an identical ball which was initially at rest. After the collision, the incoming ball (ball 1) goes off at q1 = 26° relative to its original direction and the struck ball (ball 2) moves off at q2 = 36° as...

hello, i keep getting conflicting information on these and it confuses me 1) First my book says "In series circuit the voltage supplied by the cell is "shared" between all the components, so the more bulbs you add to a series circuit the dimmer they all become." If you have a circuit...

If you have a continuous supply of water from a city main averaging 80 psi flow, will friction loss in a fire hose or pipe ever prevent water from flowing out of an opening downstream, assuming there is no elevation gain to overcome? Some friction loss calculations state that EVENTUALLY the...

I'm creating a project where I am attempting to melt solder paste using the current running through two copper wires, in a kind of lap joint. I'm trying to figure out how much current would actually be going through the wires if I use a 9V battery. I'm not sure where to take into account heat...

i doing the solar system design. seem like everything is on track now, but just the cable loss i not really know how to calculate, can anyone help me. i has formula on this (resistance on the cable (Ω/km)x length of the cable(L) x current of the solar panel(A)). for the equation above , is...

I'm doing the solar system design now . so far seem like everything is on track, but now i face a problem on the DC cable loss. is that has any formula to calculate the dc cable loss, i has using this formula is (losses of the cable (Ω/km)x length X current produce by the solar panel...

Griffith's Problem 2.40 (a) and (b) Suppose the plates of a parallel-plate capacitor move closer together by an infinitesimal distance ε, as a result of their mutual attraction. a) Use P= \frac{\epsilon_0}{2}E^2 to express the amount of work done by the electrostatic forces, in terms of...

Please redirect me to the appropriate forum if I have posted in the wrong place... This stuff is FAR over my head, and I need somebody with some real knowledge of thermodynamics and heat flow... I own a scuba dive shop and of course we compress air to very high pressure, on the order of 300...

I've been reading over Balanis' Advanced Engineering Electromagnetics in an effort to teach myself a bit about Electromagnetism. I've stumbled across a question (not one in the book) that I can't seem to wrap my head around. If there's a lossy dielectric or medium, how does the reflection...

The hydro meter for my house sits on a pole at the front of my property (5.5 acres) approximetly 200 - 250ft from my house I can't give you the wire size that runs under ground. My question is: Is there a loss of power in the distance from the meter to the house and would this result in my...

the photons emitted during the big bang, now detected as the CMBR, have been red-shifted by a very large degree due to the expansion of the universe since the BB, resulting in much lower photon energy now than when the photons were first emitted. (i hope i have that correct.) since there is...

Heat or deformation cannot contribute to velocity here, as per the view of conservation on momentum. So how is it that momentum is conserved but kinetic energy is not given a perfectly inelastic collision? The two masses stick together. There is no intrinsic means of expressing lost due to...

Homework Statement 65 kW is to arrive at a town over two 0.100 ohm lines. Estimate how much power is saved if the voltage is stepped up from 120 V to 1200 V and then down again, rather than simply transmitting at 120V. 2. The attempt at a solution First I want to find the power lost in...

I have an anaerobic digester with a volume of 2500 m^3 and internal temperature is 60°C. But, average outer temperature is 20°C. We can neglect the insulations, accept c= 1kcal/kg, and assume that the surface area of the reactor is 300 m^2. I can calculate the heat loss from e=m.c.deltaT.. Is...

I was recently going through electric machinery fundamentels by Stephen Chapman and noticed the graph of the core loss current. I need help in understanding the nature of the current graph plotted against time, like how its value stays constant for some fixed time then varies linearly.

Homework Statement (a) Consider a 10-Mev proton in a cyclotron of radius .5m. Use the formula (F1) to calculate the rate of energy loss in eV/s due to radiation. (b) Suppose that we tried to produce electrons with the same kinetic energy in a circular machine of the same radius. In this case...