What is Loss: Definition and 841 Discussions

Loess (US: , UK: ; from German Löss [lœs]) is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust. Ten percent of the Earth's land area is covered by loess or similar deposits.Loess is an aeolian (windborne) sediment being an accumulation of: twenty percent or less clay and the balance mainly equal parts sand and silt typically from 20 to 50 micrometers per particle often loosely cemented by calcium carbonate. It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs.

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  1. S

    I understanding the formula Power loss= I^2 R

    The power loss is given by I ^2 R where I is the current and R is the resitance. I know why these variables are in this equation. V = I R P = I V therefore, P = I² R What I don't understand is the practical explanations for this. Why are there two current variables? Are there two...
  2. N

    Question about heat loss from a surface

    How can I calculate the heat loss from the surface area of a box into air? Also, how can I calculate the heat/energy loss from a heated gas (into ambient air)?. Thanks in advance.
  3. N

    How Do You Calculate Heat Loss from a Box and Heated Gas?

    Hello, How can I determine the heat loss (to air) from a box of a specific material, with a heat source inside of it? Also, how do you calculate the heat/energy loss of a heated gas into ambient air. Thanks
  4. P

    Heat Equation Time dependant heat loss

    Homework Statement Solve the heat equation: u_{t} = u_{xx} - u - x*e^{-t} BC: u(0,t) = 0, u(1,t) = 0 IC: u(x,0) = x Homework Equations The Attempt at a Solution The only progress I've made so far is figuring out that the steady state solution is zero. Other than that I don't...
  5. F

    Heat gain or loss by s conductor and an insulator.

    Does anyone know of an experiment or know where I can find an experiment to compare the heat gain or heat loss by a conductor and an insulator?
  6. S

    Thermodynamics (heat loss problem)

    During 4 hours one winter afternoon, when the outside temperature was 5° C, a house heated by electricity was kept at 20° C with the expenditure of 45 kwh (kilowatt·hours) of electric energy. (a) What was the average energy leakage in joules per second (watts) through the walls of the house to...
  7. F

    Ohmic loss, ohm's law, resistance etc

    Ohmic loss, ohm's law, resistance etc... hello, just a simple question about power dissipation in the form of heat. If a conductor has infinite conductivity (zero resistivity) then the voltage across it is zero, so by the formula P= I^2 R, it dissipates zero power as heat. but if I use...
  8. N

    How to determine the minor loss for this system?

    Hi, it's me again. I've attached the diagram of the system which its minor loss is needed to be determined. Cross section profile 1 is named "cross 1" and cross section profile 2 is named "cross 2" in the given links. I stumbled yet another hurdle as I've never worked on two opposing flow...
  9. L

    Particle physics - calculate the synchrotron energy loss

    Homework Statement In the year 2000, the highest energy beams at LEP were achieved, at E = 104.5GeV. a) Calculate how much larger was the synchrotron energy loss at this energy, relative to the synchrotron energy loss at E = 45.1GeV Homework Equations E_{loss} = (E/m)^4 x...
  10. S

    How to calculate power loss in transmission cables?

    Power station generates 120kW Electricity can be transmitted either at 240V or at 24000V using a step-up transformer. The cables have total resistance of 0.4W What is the power loss when voltage is transmitted at: 1) 240V 2) 24000V I AM SURE YOU CAN WORK THIS OUT USING I...
  11. J

    Where does the loss of gravitational potential energy goes?

    Hi. Imagine a closed physical system (a universe) with only one star like our Sun, and one planet like our Earth, but so far away from each other, that the gravity from both matters only has a very small effect on each other. There is a (almost maximum) gravitational potential energy...
  12. R

    Devastating Loss: Wall Arch Collapses at Arches National Park

    http://extras.mnginteractive.com/live/media/site297/2008/0808/20080808_051413_wall_arch_before-after-1_300.jpg http://www.sltrib.com/news/ci_10142089?source=rss "Wall Arch, one of the most accessible major arches in the Devils Garden area of Arches National Park, collapsed sometime Monday...
  13. K

    Numerical Integration and Energy Loss

    Hello. I've recently been using a few different numerical integration methods to solve a number of different problems, and as I looked into the integration algorithms, I realized that I don't understand them as well as I thought I did. I created a simple Excel workbook that calculates the...
  14. D

    Medical Weight Loss FAQ | 3500 Calories = 1 Pound?

    3500 calories equals about 1 pound. However, you can get 3500 calories and 500% of your daily fat intake. Does that mean you will gain more weight? As far as I can tell, you gain the same amount except you are gaining an unhealthy amount of your calories from fat (losing out on nutrients). Maybe...
  15. F

    Optimizing Heat Loss in a Rectangular Building

    Homework Statement A rectangular building is being designed to minimize heat loss. The east and west walls lose heat at a rate of 10 units/m^2 per day, the north and south walls at a rate of 8 units/m^2 per day, the floor at a rate of 1 unit/m^2 per day, and the roof at a rate of 5 units/m^2...
  16. M

    Universe cyclic model and energy loss

    I'm "aware" of current theories about the cyclic model but what's wrong with this hypothesis? The universe starts crunching forming a big black hole All the energy is sucked back into this big black hole The big bang starts again with all the matter and energy as the previous big bang...
  17. J

    Heating a house, energy loss to surroundings

    Tried to figure this out for a friend but couldn't quite get it. Here is the problem. For 3 hours one winter afternoon, outside temp is 0* C. A house is heated and kept at 20* C with the expenditure of 45 kwh. What was the average energy leakes in joules per second through the walls of the...
  18. E

    Is Identity Death Possible Through Brain Damage?

    Alright, I'll need some help formulating this, since my writing tends to be... well... just not very eloquent and representative of my thoughts. I don't believe in soul, afterlife, or other nonsense. I think our self, our consciousness, is a function of our complex brains. For what...
  19. L

    Sun's Mass Loss: How Much Is Lost Annually?

    How much mass does the sun lose every year?
  20. G

    Loss of simultaneity explained by classical physics

    if an object is made of particles that are interacting via electric and magnetic fields that propagate at the speed of light then does it not follow that a moving object will experience a loss of simultaneity? in other words, it is not necessary to go outside of classical physics to explain...
  21. C

    Energy Loss in Scintillators

    Hello, I'm working on a Time Of Flight simulation to detect some pair/particles and I need some information about the "Energy dependence of the light yield of PST scintillators" Does anyone have information about this? Thank you in advance.
  22. L

    What is the value of the loss volt and internal resistance of the battery?

    Homework Statement When a current of 2A flows the p.d across a battery's terminal falls from 12V to 9V. (a) What is the value of the loss volt? (b) What is the internal resistance of the battery? Homework Equations Lost Volt = Ir The Attempt at a Solution (a) 12V - 9V = 3V R =...
  23. A

    Investigating the loss of nitrogen as urea from the body.

    Homework Statement I am required to plan an investigation to find out how changes in the consumption of protein in the diet influences the excretion of urea in humans. Apparatus: 10g per 100cm3 (10%) solution of urea. Urease tablets or 5g per 100cm3 (5%) solution of urease...
  24. G

    Heat Loss in a House: Estimating k_eff

    Homework Statement In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is T_in= 20degrees C and the temperature outside is T_out = 0degrees C. The walls and uppermost ceiling of a typical house are supported by 2 x 6-inch wooden beams...
  25. A

    Why is there a pressure loss with friction?

    If a fluid has reached steady flow, ie constant velocity, yet there is friction created by the shear stress of the wall, i don't understand how the pressure can drop. I tried using bernoulli to see how this would happen, but i can't see it. If the velocity doesn't decrease, i don't understand...
  26. S

    Investigating the loss of nitrogen, as urea, from the body

    I need to plan an investigation to find out how changes in the consumption of protein in the diet influence the excretion of urea in humans. it is possible to determine the urea concentration in urine using the enzyme urease which catalyses the following reaction: Urea+Water --> (with...
  27. S

    Hawking radiation & Information loss

    What if there is no hawking radiation i.e if it is not proved..i think it is not yet proved...so will it have any influence on information loss paradox..if there is no hawking radiation then the information would be inside black hole and not accessible..so there is no information loss paradox if...
  28. N

    Minor loss due to Sudden contraction (help needed)

    Hi, I am an undergraduate, doing an experiment regarding of minor losses due to sudden contraction. However, I found that my theoretical loss is higher than the experimental loss. The flow rate = 3.28*10^-4 (m^3/s) (Inner diameter) D1= 3.652*10^-2 m (Inner diameter) D2= 1.539*10^-2 m by...
  29. ~christina~

    Solving Mass of N Loss from Cu at 20C to 77.3K

    [SOLVED] Mass of N loss Homework Statement 1.00kg block of Cu at 20C is dropped into a large vessel of liq Nitrogen at 77.3K. How many kg of Nitrogen boil away by the time the copper reaches 77.3K? specific heat of Cu is 0.0920cal/g C. The latent heat of vaporization of Nitrogen is 48.0cal/g...
  30. T

    Friction Mass Loss: Formula to Find Lost Mass

    When a solid body is moving on any hard surface due to friction it will lose some very little part of its body; as when we take a broken piece of glass and rub it on the concrete surface, it loses some mass of its initial mass. so, what is the general formula of finding the lost mass due to...
  31. E

    The Energy Loss in a Capacitor Circuit: Exploring the Missing Energy Phenomenon

    Circuit 3(connected to a 3v battery,C2 and C3 in series, C1 and C23 in parallel) C2 C1 C3 c1=c2=c2=1F Circuit 4(Two unequally charged capacitors are connected to each other,from setup above) C1 C2 In circuit 4, after the...
  32. J

    How Do Astrophysicists Measure Solar Mass Loss?

    From nuclear theory and texts its known that every second 570 millions tons of hydrogen are converted to 566 millton hellium,hence Sun loss 4 mill tons of mass in a second. But ¿how do astrophicisist probe experimentally this number?,have they measured solar gravity field or Earth atraction...
  33. F

    Calculating Total Energy Loss of a Newton's Cradle

    How can I measure the total energy loss of a Newton's cradle until it comes to rest. The only variables I am given are the horiztonal displacements for each swing (how far the ball travels out after it rebounds off the other balls) and the angle. I have no idea where to start, I was told I...
  34. S

    What is the Information Loss Paradox and How Does Hawking Radiation Relate?

    can someone explain information loss paradox in layman terms without using any quantum physics terms...i read in some sites but i couldn't understand as they are explaining using some jargon terms...
  35. F

    Rate of heat loss with two thermal conductivity values

    Strangely, this is for a Mat Sci Class. It is probably not as complicated as I am making it out to be, but the book has no suggestions on how to handle this problem. Homework Statement Calculate rate of heat loss through a fireclay refractory wall of wall with thickness .1m. Furnace...
  36. blindconsole

    Loss of Motivation: First-Year EE Grad Student Seeks Tips

    I'm a first-year EE grad student at a prominent university, and I feel like I'm at an impasse. Basically, I've lost all interest in my research, as well as my (once strong) peripheral interests in physics and math. I have no more motivation. At the risk of sounding like I'm venting, I really...
  37. S

    Conservation of Energy With Loss Due to Friction

    [SOLVED] Conservation of Energy With Loss Due to Friction Homework Statement The cable of an elevator of mass m= 2690 kg snaps when the elevator is a rest at one of the floors of a skyscraper. At this point the elevator is a distance d= 75.0 m above a cushioning spring whose spring...
  38. G

    Rate of heat loss? Speed of heat.

    I have some extended aluminum part which is at low temperatures. It is connected by a thin alu rod to a cooling device held at a constant temperature. How can I estimate the rate of cooling through this thin rod given the material specific constants? I assume the heat exchange with the...
  39. Ivan Seeking

    Medical Can deep-brain stimulation reverse memory loss?

    http://www.independent.co.uk/news/science/scientists-discover-way-to-reverse-loss-of-memory-775586.html
  40. P

    Calculate Energy Loss from Parachutist Jump

    A parachutist with a mass of 50.0 kg jumps out of an airplane with an altitude of 1.00 x 10^3 m. After the parachute deploys, the parachutist lands with a velocity of 5.00 m/s. Find the energy that was lost to air resistance during th jump. I tried using this: W = Kf – Ki → W = ½ mv^2 (f) –...
  41. M

    Finding the Muon decay length reduced by Ionization loss

    I'm doing a Monte carlo simulation of cosmic ray interactions in the atmosphere, and as part of this I need to calculate how far a decaying particle travels before it decays In vacuum it would be simple: l_D = c \tau \gamma \beta with a probability of traveling the distance l before decay: P_D...
  42. P

    Fluids - Head Loss complicated

    Homework Statement Heated air at 1 atmosphere and 35 deg. Celsius is to be transported in a 150 meter long circular plastic duct (smooth) at a rate of 0.35 cubic meters/sec. If the head loss in the pipe is not to exceed 20 meters, determine the minimum diameter of the duct. Homework...
  43. G

    Energy loss of spectra associated with Window Functions

    I'm doing research on window functions (such as: rectangular, Hanning, Blackman, etc), but am having trouble with respect to the energy loss associated with each. I know that applying the window causes energy loss in the spectra of interest, and for the Hanning Window and Hamming window...
  44. G

    Energy loss of spectra associated with Window Functions

    I'm doing research on window functions (such as: rectangular, Hanning, Blackman, etc), but am having trouble with respect to the energy loss associated with each. I know that applying the window causes energy loss in the spectra of interest, and for the Hanning Window and Hamming window...
  45. U

    Calculating Power Loss from Voltage Change at 3 Ohms Resistance

    Homework Statement a power station delivers 520kW of power to a factory through wires of total resistance of 3 ohms ,how much less power is wasted if the electricity is deliverd at 50,000V rather than 12,000V Homework Equations P=IV=I^R =V^/R The Attempt at a Solution I tried to...
  46. B

    Calculating Nonconservative Energy Loss in Pumped-Storage Reservoirs

    new problem! A pumped-storage reservoir sits 136 m above its generating station and holds 9.0×10^9 kg of water. The power plant generates 346 MW of electric power while draining the reservoir over an 6.9 h period. What fraction of the initial potential energy is lost to nonconservative...
  47. B

    Computing average rate of mass loss from sun

    Homework Statement Using the data on the solar wind given in this chapter, compute the averagerate of mass loss of our Sun(M(sun)/year) from: a)the solar wind b)energy generation Homework Equations possible equations: Energy density =(#density)*(energy per particle)= n*(3kT/2)...
  48. P

    Head loss due to sudden expansion

    Hi all, I'm sure a lot of you know about the head loss due to sudden expansion: Hl = (1/2g)*(v1-v2)^2 This equation can be derived from Bernoulli, continuity and momentum balans equations. The underlying assumption in deriving this equation is that the pressure just after the expansion...
  49. M

    Calculate Water Temperature in Pond Receiving Hot Water: Formula Included

    I have an open water pond which will be receiving hot water (75oC) at a continuous steady rate. I want to know the temperature of the water leaving the pond at the other end. Is there a formula I can use to calculate this from the following information? Volume of pond (1650m3) (25mx25mx2m...
  50. turbo

    Dealing with Loss: The Passing of Bill's Dad

    The father of one of my best friends (and I have known them both for about 40 years) died today in a traffic accident. My friend thinks that his dad may have dozed off during a drive to a medical appointment, but we may never know. I found out through phone calls from family members and was...
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