What is Per: Definition and 565 Discussions

PeR (Please Explain the Rhythm) is a Latvian pop and beatboxing band formed in 2007. The original line-up was Ralfs Eilands, Emīls Vegners, and Pēteris Upenieks. Vegners left the band in 2007 and was replaced by Edmunds Rasmanis. But when Upelnieks left the trio in 2011, he was not replaced, rendering the band a duo consisting of just Eilands and Rasmanis. After three failed attempts in earlier years to represent Latvia in the Eurovision Song Contest, PeR won the 2013 Dziesma contest and represented the country in the 2013 Contest with the song "Here We Go" and placed last in the second semi-final.

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  1. F

    A Photons per unit of Energy in Cherenkov radiation?

    If I have a beam of protons that go into a block of water, how can I know how many photons will be produced along the beam path?. I'm assuming all the photons have the same energy. I know that the energy deposition will follow a Bragg Curve, and I think that energy deposition is probably...
  2. E

    I Understanding the Multiverse per David Deutsch

    I find David Deutsch to be interesting, however I find his writing style a little hard to follow at times. If anyone can shed light on what he means by the following, it would be appreciated: "the multiverse is not a discrete set of universes but a continuum" I can accept the concept of a...
  3. Callum Plunkett

    The relationship between percent and per unit impedance

    Homework Statement For one of my assignments I’ve been ask about the relationship between percent impedance and per unit impedance. Homework EquationsThe Attempt at a Solution I know that the x% is determined in transformers by short circuiting the secondary windings and slowly increasing the...
  4. Drugstore Cowboy

    I Solar spectral intensity per wavelength - frequency

    Why is solar spectral intensity per wavelength different than solar spectral intensity per frequency?
  5. A

    MCNPX - How calculate Kerma (kinetic energy released per unit mass) in Air?

    Hi, my name is alexander, i am student from Institute of radioprotection and dosimetry (IRD). My project is calculate MGD (mean glandular dose) from womans with augmented breast. i am having dificulties to calculate Kerma in air with mcnpx. I drew a block of air above the breast, i am using the...
  6. Krushnaraj Pandya

    Resonance energy per ring in benzene, napthalene, anthracene

    Homework Statement Compare resonance energy per ring in benzene, napthalene and anthracene Homework Equations -- The Attempt at a Solution I know Resonance energy of benzene is 36 KCal/mol, I also know anthracene is the most stable followed by napthalene so their resonance energy is in the...
  7. P

    Stimulated emission per second per atom?

    Homework Statement We are investigating hydrogen in a plasma with the temperature 4500 ºC. Calculate the probability per atom and second for stimulated emission from 2p to 1s if the lifetime of 2p is 1.6 ns Homework Equations Planks radiation law: ##\rho (f) = \frac{8* \pi...
  8. P

    Probability per atom and per second for stimulated emission to occur

    Homework Statement We are investigating hydrogen in a plasma with the temperature 4500 ºC. Calculate the probability per atom and second for stimulated emission from 2p to 1s if the lifetime of 2p is 1.6 ns Homework Equations ##A=\frac{1}{\Sigma \tau}## $$A_{2,1} = \frac{8*\pi *h *...
  9. jim mcnamara

    There is no ET - per Anders Sandberg et al

    Can anyone find an actual paper? I cannot. This is an un-refereed citation, more like a slide show for a talk: "Dissolving the Fermi Paradox" Anders Sandberg, Eric Drexler, Tony Ord...
  10. L

    MHB Calculate Present Value of 10-Year Lease w/ OCC & Variable Rental

    Hi all Trying to improve my level of maths and would like some help with the below question please. A 10-year lease with annual rental payments to be made at the end of each year, with the rent increasing by 2% each year. If the first year rent is £20 and the OCC is 10% per year, what is the...
  11. riley4190

    How many hours per day should I learn physics and maths

    Hello everyone, I'm a high school student, currently in 10th grade. I'm going to major in physics, I'm interested in how many hours should I study physics and maths per day to do my best and to be as smart as possible? I don't only want to master high school materials, I also want to learn...
  12. C

    Work done per unit charge by electric field on charge

    Homework Statement Homework EquationsThe Attempt at a Solution I know the units for V is J/C so #3 and #4 are wrong. But how do I determine the signs?
  13. T

    Heat Transfer & Combustion: Estimate Pipe Heat Loss/m

    << Mentor Note -- poster reminded to use the standard Template >> Question Three A pipe of outside diameter 200 mm is lagged with an insulating material of thermal conductivity 0.06 W m-1 K-1 and thickness 75 mm. The pipe carries a process fluid at a temperature of 300 °C and the average...
  14. H

    MHB How Do You Calculate Average Revenue Per Group?

    Hi, I'm currently stuck on a homework question and I was hoping if I could get some help. Group A has 50% chance of ordering french fries (price: 5),40%chanceoforderingmilkshake(price:6), and 10% chance of ordering a burger (price: 7).GroupBhas30%chanceoforderingfrenchfries(price:5), 30% of...
  15. D

    MHB Proper method to calculate damage per second for Role Playing Games

    A friend and I have reached a disagreement, and truly neither of us can come up with the math to prove one of us right or wrong. So I pose the question in here for someone to offer me a proof of which theory is correct. The question is about what is the proper way to calculate damage per...
  16. HelloCthulhu

    Floating Water Bridge and Dielectric Strength per Volume

    I recently watched a great video demonstrating the floating water bridge experiment: At around 34 sec, you can see an electrostatic discharge before the water bridge forms. I've read that this is due to the electrostatic breakdown of air between the two beakers.This made me curious about the...
  17. Pushoam

    Change in entropy per mole for an isothermal process

    Homework Statement Homework EquationsThe Attempt at a Solution ## dS = \frac { dQ_{rev} } { T } ## Assuming that isothermal process is a reversible processes, ## dU = dQ – pdV## For isothermal process, dU = 0. ## dQ = pdV ## ## pV = nRT##, where n is number of moles. For one mole, ##...
  18. Pushoam

    Free energy per unit volume of an ideal gas

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] I am taking the free energy as the internal energy of the ideal gas. Then the average internal energy per unit volume is ## \frac { 3 nk_B T } {2 } ##. So, the correct option is (c). Is this correct?
  19. MCTachyon

    Net calorific value (CV) per kmol of an fuel/air mix

    Homework Statement [/B] A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by volume. It is to be fed to the combustion chamber in 10% excess air at 25°C, where it is completely burnt to carbon dioxide and water. The flue gases produced are to be used to...
  20. karush

    MHB 30 Calculate the book value per share

    $\text{$32$}$ $\text{Newmarket Industries currently has $2,000$ shares of common stock outstanding. }$ $\text{The Firm has assets of $\$200,000$ and total liabilities including preferred stock of $\$75.000$.}$ $\text{Calculate the book value per share of Newmarket common stock}$...
  21. T

    Boussinesq theory (load per unit area)

    in question 10.19 , i use equation 10.26 to do the question . I have all the values of all variables , except q ( load per unit area) ... Homework EquationsThe Attempt at a Solution How to get q ? It's not stated in the textbook . Is there something to do with the homework =4m ?? I assume q =...
  22. C

    MHB Conversion KWH of energy per day to Joules in a year

    What is the average power consumption in watts of an appliance that uses 6.65 kW*h of per day? 6650/24=277 W b) How many joules of energy does this appliance consume in a year? What is the conversion factors for b)?
  23. S

    Calculating revolutions per minute

    Homework Statement A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the...
  24. T

    What determines bytes per second a computer can process?

    What are the factors which determines how many bytes / kilobytes / gigabytes of data a computer can process every second? Are there any equations / formula / rules that can be used to work this out.
  25. S

    MHB How do I merge two age groups per 10k from an abortion rate table?

    I would like to find the 12 to 19 abortion rate per 10,000 women from the following table: This would be the merging of age groups "12-17" with "18-19" to some how get the 12-19 abortion rate. EDIT: "Distribution of abortion age" was translated from "Répartition des ges l'avortement" in...
  26. Z

    How Does the Cost Per Person Change with Fewer Passengers on a Charter Flight?

    Homework Statement A group can charter a particular aircraft at a fixed total cost. If 36 people charter the aircraft rather than 40 people, then the cost per person is greater by 12$ a) What is the fixed total cost to charter the aircraft? b) What is the cost per person if 40 people charter...
  27. I

    Why is there only one set of blades per wind turbine?

    I'm a civil/structural engineer and I was just recently thinking about one of the biggest issues for maximizing the efficiency of a wind turbine - the structure itself. The mega turbines that engineers want already have foundations of titanic proportions because as we all know, flag pole...
  28. J

    Convert mg/s to SCCM (Standard Cubic Centimeters per Minute)

    Hello, Can anyone explain the procedure to convert mg/s to SCCM? I'm working with an Alicat Mass Flow Controller, which regulates Argon (Ar) mass flow from 1 to 6 mg/s at 27o C or 300 K (room temperature). For documentation purpose, I need mass flow in terms of mg/s, as well as, SCCM. Thank...
  29. Z

    Converting grams into Milligrams per 100 grams

    Homework Statement What is the ratio of the amount of Vitamin C in 500 grams of orange to the amount of Vitamin C in 500 grams of orange juice? There is a graph associated with this question which is attached. I can't find out the amount of Vitamin C in 500 grams because the data is given...
  30. M

    MHB What is the cost per ticket when buying a roll of 25 tickets for 15 dollars?

    Tickets at a fair cost 75 cents each. You can also buy a roll of 25 tickets for 15 dollars. What is the total cost of each ticket if you buy a roll of tickets? Is this a proportion problem? Do I divide 25 by 0.75 to find the total price for each ticket?
  31. Adam Rabe

    Impulse question given flow rate (litres per second)

    Homework Statement A fireman's hose acting as a water cannon, directs 100 litres/s (100 kg/s) of water horizontally at your chest at speed 5 ms-1. Assuming water essentially falls to the ground after hitting your chest (rather than say reflecting horizontally backwards), what horizontal force...
  32. clamatoman

    How many Photons per second are entering the pupil?

    Homework Statement (a)Estimate the number of photons per second emitted by a 100-W lightbulb, assuming a photon wavelength of 550nm.(b) A person can just see this bulb for a distance of 800m, with the pupil dilated to 7.5mm. How many photons per second are entering the pupil? Homework...
  33. pallab

    Correct option for n dependence of free energy f per unit

    Homework Statement The equation of state of an ideal gas is p = nkT, where p is the thermodynamic pressure and n = N / V is the thermodynamic variable for the number of particles per unit volume. The n dependence of the free energy f per unit volume of the ideal gas is obtained by the following...
  34. T

    MHB How to factor in critical chance to calculate damage per second?

    Ok so essentially in this video game I have there are certain stats on swords. The stats are the amount of Attack animations, amount of time to compleate all of the attack animations, sword dammage and critical chance. All of the animations deal the same amount of dammage and the time to...
  35. O

    I How is the order of events reversed in 1 trillion frames per second videos?

    First I am not sure if this is the correct place to post this thread, but the thread will be about optics, quantum physics and special relativity, so it is a mixed subject. Please watch this video first: This technology allows capturing videos at mind blowing 1 trillion fps, which allows us...
  36. A

    Calculate steam raised per hour

    Homework Statement A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by volume. It is to be fed to the combustion chamber in 10% excess air at 25ºC, where it is completely burnt to carbon dioxide and water. The flue gases produced are to be used to generate 5...
  37. T

    Sound & Music - Mass per unit length

    Homework Statement Suppose a harp string is tuned to middle C (C4) and is 0.56m long. If I want the tension to be 193.5 N, what mass per unit length do I need the harp string to be? Calculate your answer in kg.m Homework Equations Vs = sqrt(T/μ) V = fλ The Attempt at a Solution Having a very...
  38. grandpa2390

    Why is the Velocity equal to joules per kilogram?

    Homework Statement Calculating the rms speed of an N2 molecule. The units I end up with are J/kg and this is equivalent to Velocity. my question is why? Homework Equations v = J / kg KE = .5mv^2 The Attempt at a Solution I tried to derive it myself using the kinetic energy formula. What I end...
  39. A

    Around how much do hot plate heat knobs increase per number?

    In my labs we use hot plates with a 0-10 temperature knob. The hot plates don't have a temperature monitor, so i have no idea how hot each number can increase it or how hot it is at the time. Sometimes i have labs where i have to heat something to more specific temperatures or else the reaction...
  40. joeyc

    Force per unit length acting on four parallel wires

    Homework Statement An arrangement of four wires, in cross section, with θ=30° and u=5cm. Wire 2 and wire 4 carry the same magnitude of current (I2=I4=10mA) directed out of the page. Wire 3 carries current I3=25mA directed into the page. If the resultant force per unit length on wire 1 is zero...
  41. A

    Inductance per unit length of coaxial transmission line

    1. Homework Statement An air coaxial transmission line has a solid inner conductor of radius a and a very thin outer conductor of inner radius b. Determine the inductance per unit length of the line. Homework Equations the book states the methodology to find the inductance as follows: 1)...
  42. I

    How many state changes per second could optical computing do

    Using Optical Computing, what is the max amount of state changes that 1 transistor could theoretically have within 1 second? I once read that an electrical transistor could achieve 100 billion state changes per second, but I'm wondering what the number is for light, *and what it could...
  43. 8

    MHB Therefore, the additional cost for extending the insurance by 1 day is $32.

    Triangle Construction pays Square Insurance 5980 dollars to insure a construction site for 92 days. To extend the insurance beyond the 92 days costs $97 per day. At the end of this period, if Triangle extends the insurance by 1 day, how much more does Triangle pay for that day than it paid per...
  44. H

    B How do I go about calculating the expected profit/winning per play of this game

    I designed this game for my Data class but I'm having a lot of trouble calculating the expected profit per play of this game. We have taken up examples involving lottery tickets in which you have to calculate the profit and winning per ticket bought but I can't seem to apply the same concepts to...
  45. D

    Decide the resulting force (F) per meter on L2

    Homework Statement Three long straight parallell wires that conduct electricity called L1, L2 and L3. The angle at L2 is 90 degrees and the distance between L2 and L1, L3 is 0,50 meters. The current through the wires L1 and L3 is 300 A while the current in L2 is 600 A. Decide the resulting...
  46. TheBigDig

    Finding the energy dissipated per cycle in a Stirling Engine

    1.Recently, we performed an experiment to measure the efficiency of the Stirling Engine. The experimental method can be seen in the image provided. We have been asked to calculate the power dissipation PR and the energy dissipation per cycle WR as part of our lab report. The other variables...
  47. HyperTechno

    Does using dual spark plugs per cylinder make any difference?

    There is this bike manufactured in India with a 180CC single cylinder petrol engine with Twin Spark plugs. They highly market their "twin spark technology". Well according to my knowledge, I don't think that will make much difference in performance and efficiency. What do you think? Is this just...
  48. C

    How Many Electrons Does a Cathode Ray Tube Emit Per Second?

    Homework Statement The beam of electrons in a cathode ray tube contains electrons traveling at 8.4x106 ms-1 and the current throgh the tube is 2.8 micro A. a) how many electrons are emitted per second from the cathode of the tube b) what is the number of electrons per unit length of the beam...
  49. moenste

    Average mass of iron worn off the ring per day

    Homework Statement When iron is irradiated with neutrons an isotope of iron is formed. This isotope is radioactive with a half-value period (half-life) of 45 days. Give the meanings of the terms printed in italics. A steel piston ring of mass 16 g was irradiated with neutrons until its...
  50. C

    I Parts per million of vapor above a liquor in a sealed jar

    How would you calculate the concentration of a vapor above a liquid in a sealed jar in parts per million? Supposing that the liquid is a 10% solution of X with known vapor pressure. We've gotten to this point: 1ppm = 1mgX/ g solution 1ppm = 1mgX/1mL solution (assuming it's water and water has...
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