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.
Hi!
I have a loss head question.
There is a difficulty in understanding the hydrodynamic loss head concept.
Assuming that there is a one-sided tube with incompressibility, visibility, tube friction coefficient and cross-sectional area A..
There is friction in the loss head formula, but is the...
Hello,
Im currently hearing a module about quantum computing and Im wondering what is the difference of a loss and cost function for variational quantum algortihms? Both functions also can be presented into a loss/cost landscape? Are they the same ?
Already a big thank you for all the upcoming...
Assume that a closed system of cylindar filled with ideal gas consists of a movable piston.We know from the 1st law dQ=dU +dW.
According to the 2nd law mechanical energy can be totally converted into heat energy but heat energy cannot be converted completely into mechanical energy.The question...
I got answer for (a), which is 0.51 m
For (b), loss of potential energy = 35 x 9.81 x 0.51 = 175 J
Rate of loss of potential energy = 175 J / 1 s = 175 W
But the answer key is 80 W. Where is my mistake?
Thanks
Hello,
My house has some heat loss. As an example I know the outside door temperature. How can I calculate the heat loss delta if I reduce the door temperature by 1 degree?
I know that there is a formula to calculate a heat loss based on the U-value of a fabric. But I can't get those values...
During the procedure, 30% of heat is lost. So that means that 70% of water+container is contributing to melting the ice, right? And the other 30% contributing melting the ice is down to, well, the "heat being lost to the surroundings" (not sure what this really means).
We compute the sum and...
I am trying to simulate mode loss for a waveguide and the units I get for loss are dB/mm, but I want to convert the units to just mm^-1 so I can the absorption (α) value. I am guessing there is a specific value that I need to either multiply or divide my values with, but I'm just not sure what...
Hello,
I am looking for assistance regarding temperature losses along a length of pipe with hot air entering one. I need to know the temperature leaving the other end of the pipe.
I have been able to calculate the W/m-K (in theory but stopped a i knew the answer wasnt what i needed) losses but...
I know how to solve the question but I am a bit confused about why there is a current of 3 A and a voltage of 110 V requirement for the refrigerator but the power plant only supplies 110 V.
How can there be a voltage drop on the refrigerator load of 110 V, when there is also a voltage drop on...
If an observer never falls into a black hole, something it observes that does fall in takes an infinite time to reach the event horizon.
If an observer falls into a black hole along with an object, it will not lose information on the falling object, but will lose that from the outside of the...
Ok my approach on this, i let the cost price = ##x##, then it follows that cost price per banana will be given by;
##\frac {x}{10}##=##\frac {x}{12}##
##\frac {x}{10}-\frac {x}{12}##= loss
##x####\left[ \frac {1}{10}-\frac {1}{12}\right]##=loss
##x####\left[ \frac {1}{6}\right]##=loss
therefore...
Large loss-:
Book says
" The size of loss must be meaningful from the perspective of the insured. Insurance premiums need to cover both the expected cost of losses, plus the cost of issuing and adminstering the policy, adjusting losses and supplying the capital needed to reasonably assure...
Hi,
I have been calculating a series of hypothesis for some aquariums/tanks situations, using heat transfer equations (conduction, convection, radiation, evaporation)
Typically we have aquariums that run at higher temperatures than the surroundings in winter and lower temperature than the...
Hello everyone. I have just complete an experiment calculating the speed of a muon. I got it to 2.6E8 m/s, however I know that they are created at close to speed of light to be able to get down to Earth's surface in their short lifespan. This speed could not have been its initial speed, as it...
Given the AC Induction (asynchronous motor) in 3 phases:
Parameter
Value
Pn (Nominal Power) = Pmechanical (output power at the shaft)
5 kW = 5000W
uls (Voltage through the stator line)
220 V
fstator (stator frequency)
50 Hz
p (Number of pole pairs)
2
LFe (Iron loss) = Lmechanical...
Hi there,
if a dielectric (capacitor) is described with a constant permittivit eps (or C) and loss-tangent DF, how much energy ist lost when charging the capacitor by 1V?
For example: C=1, DF=0.1.
When charging from 0 to 1V, the lost energy (in J) is ...?
When charging from 1V to 2V, the lost...
We (company I am interning for) are meeting with various suppliers in efforts to find a new source of vacuum pumps for our brake boosters. We are looking to make a switch to an electrical pump versus the mechanically-driven pump we used previously. One of the issues we are having with this is...
a) Output voltage = 2 x 6 = 12 V
Current in R = 12 V / 13.5 kΩ = 8.9 x 10-4 A
That is the correct answer based on the solution but I don't understand why when calculating the current in R, the resistance of secondary coil is not considered. I thought it should be like this:
Current in R = 12...
Generally, one would expect the beam to lose its content (energy or particles) if it hits anything before its reaching its target. The whole idea of maintaining (conventional) vacuum using pumps or other means is to minimize that loss. But is it possible that there could be a beam loss purely...
Explanation 1:
Eddy currents induced, energy loss due to joule heating.
Explanation 2:
Eddy currents induced, induced magnetic dipole formed. Energy is lost as work has to be done to overcome the attractive/repulsive force due to the magnet and the induced magnetic dipole from the eddy...
If I am not mistaken (hopefully) then the highest loss through the mirror ends in a magnetic mirror happens with particles that have a higher parallel component to the field lines than a higher perpendicular (gyro frequency).
In a magnetic mirror if we map these properties onto the real physical...
My interest is on question ##11.ii## only. I think there is a mistake on the markscheme...i just need a second opinion on this...find attached the question and markscheme...
markscheme here:
it ought to be,
##e^{0.0277t}=1.6797##
Hello, there. I am studying a model for decoherence of two entangled photons. The space for the first photon is 2 dimensional, while that for the other one is 6 dimensional. In total, the system will be in a 12 dimensional space.
Initially, they are set to one of the Bell states, such as...
https://www.medrxiv.org/content/10.1101/2021.06.11.21258690v1
doi: https://doi.org/10.1101/2021.06.11.21258690
Full PDF (32 pages) at:
https://www.medrxiv.org/content/10.1101/2021.06.11.21258690v1.full.pdf
I was thinking about the Gravity-B probe and the rotation of the satellite due to the Lense-Thirring effect. I was imagining that the satellite, once in orbit, was aligned to a distant star using retro rockets effectively rendering it non-rotating relative to that star. That being said, once...
Hi,
I started to think about the drag coefficient of a sphere. At high Reynolds number Cd drops of suddenly when the boundary layer separates. If the Reynolds number is increased further, Cd increases with increasing Re. (I'm thinking about what is referred to as "post critical separated flow")...
The study material says under 'Estimation of magnetising losses' :On no-load, the rotor current is very small and the slip almost zero. Therefore, R′2s is very high and virtually no current flows through the branch of the circuit containing R′2s. Consequently, the no-load current is virtually...
Attempted solution:
Consider the instant when the normal force of the lower ball is zero. Conserving energy:
$$\frac{mv^2}{2}+mgh_1=\frac{mv_1^2}{2}+\frac{mv_2^2}{2} + mgh_2$$
Applying the resulting torque to the upper ball where the rotation point is the lower ball.
$$T=I.a =...
Hi everyone
I'm writing a story in which someone passes out from blood loss before they are found and saved. How long might a rescuer have before the victim dies? I'm guessing there might be a lot of variables here, but I'm just looking for the longest possible realistic delay.
Also, if...
I am trying to calculate head loss for a sloped pipe.
I found this calculation here, which seems to be what I want..or at least a start:
https://www.pumpsandsystems.com/pumps/april-2015-calculating-head-loss-pipeline
My confusion/skepticism arises from the fact that the equations in the above...
I am given the answer is 2J and I know how to get there with U = q^2/2C. But what I don't understand is that why is the energy not conserved here? How can energy loses just because the capacitance is doubled?
Hi!.. As known, a certain amount of energy is applied for compressing a mechanical spring. Thus mechanical spring is charged with energy and it stores it as elastic-potential energy. But whole energy, applied for compressing spring, can not be converted into potential energy. The reason is...
My goal is to determine the ideal amount of air flow, in order to keep CO2 below 1000ppm and to minimize heat loss.
I calculated the following based off a similar post in this forum, and I am hoping this can be verified so I know that i am in the right ballpark and going in the right direction...
Can you compare the energy loss of electrons and protons due to the radiation they emit? In fact, I want to know which of the two loses more energy when it emits radiation.
I have created almost 6000 anki cards on ankidroid(android) and I get nightmares about loosing them by deletion(of course mistakenly) or due to some 5 year old monster who just wants to delete them for fun.
I sync the cards daily and I am unsure if I will be able to get my cards back if they get...
Imagine water flowing inside this from say left to right.
Energy can't be destroyed or created. Pressure can reduce due to the three 90 degree turns. Is the pressure or energy loss due to the heat or deformation or kinetic energy loss of the water to the wall inside? What must be the wall be...
https://www.asi.edu.au/wp-content/uploads/2016/10/ASOEsolns2012.pdf
Q11 D) Markers comments: Few students reached part (d) and very few of those who did realized that the amplitude does affect the time taken for each of Mordred’s bounces. i.e. the energy losses results in shorter periods...
Hi, I could really use help. I am trying to understand what would happen to the velocity of a freestream air if it loses mass while traveling down a tube. For example, suppose that you have 1 cubic meter of air traveling at 10 m/s down a duct with a 1m^2 cross section. And then suppose that you...
Hello, everyone,
I am currently working on the following (real) problem, where I am not getting anywhere.
It would be super nice if you could have a look at this. Thank you very much :-).
I have a pipe system (Black Box) of which I only know the following things:
At a set flow rate with a...
Hello all
I was hoping someone can help with the following problem.
I am trying to create a parabolic formula to give me target weight.
For example:-
Day 1 = Target Weight 100kg
Day 112 = Target Weight 67kg
Each day is consecutive - can anyone help me to create a parabolic formula that goes...
Problem, with state values, and pie chart (Fig 4.20) showing answers:
^ This shows the system in question (Kapitza Liquefaction System). Methane gas enters into the compressor (c), then goes through the first heat exchanger (HX1). Some of it (z) gets routed to the expander (exp). Afterwards...
Hi,
So the main question is: How to deal with power loss in E-M waves numerically when we are given power loss in dB's?
The context is that we are dealing with the damped wave equation: \nabla ^ 2 \vec E = \mu \sigma \frac{\partial \vec E}{\partial t} + \mu \epsilon \frac{\partial ^ 2 \vec...