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. P

    Conversion question: normal litres per min to velocity

    Homework Statement So, I am going to be doing a simulation of a combustor, with premixed air + fuel, and for input I'll need to put in the velocity. I've been given the flow rate in units of Normal litres/min (air = 2000Nl/min, fuel = 25Nl/min), as well as the normal density (normal density...
  2. B

    How to Find a Basis for W in P4[x] Using the Gram-Schmidt Process?

    I need some direction with respect to this problem please: Define the inner product on P4[x] over \Re as follows <f,g> = \int_{0}^{1}\f(x)g(x) dx let W be the subspace of P4[x] consisting of the poly. ) and all polynomials with degree 0, that is W =R Find a basis for...
  3. H

    Medical What is the true calorie burn for cardiovascular activities?

    I'm trying to figure out the realistic calorie burn for a person involved in a cardiovascular activity. Google helps little, because there are all sorts of wildly ranging numbers and 99% of them are uncited or second- or third-hand. I'd like a scientific source. Let's assume an untrained...
  4. J

    History GPD, GDP per capita, India's economic history

    Please reply in layman terms. Thanks. Gross Domestic Product, GDP, is the amount of goods and services produced in a year, in a country. It is the market value of all final goods and services made within the borders of a country in a year. I think it's the financial value (in other words...
  5. A

    Elephant toothpaste per cubic meter

    what is the best formula for elephants toothpaste not using yeast using potassium iodine and hydrogen-peroxide(30%) and of course soap. how much reactants would i need to fill let's say... 100m cubed (im not going to do that much but its easier to work with) * how long would the reaction take...
  6. M

    Effect of adding two per share quantities

    Hi, Please see the attached document. In a simple calculation, I am trying to add the cash flow per share of two companies. I think I am doing something wrong as I am not able to reconcile the results of this calculation to the actual results. Can you please take a look? Thanks, MG.
  7. P

    What Does 0.1 Expected Photon Per Pulse Mean in Quantum Cryptography?

    Maybe a stupid question, but anyway. The paper "Experimental Quantum Cryptography" by C. Bennettet al. discusses laser pulses of 0.1 expected photon per pulse. What does that mean physically? Is it that 90% of laser pulses are not pulses at all, containing no photons and thereby no energy? Or...
  8. I

    Calculating distance travelled per revolution

    Hi, A cylinder is to be coated on a rotating lathe, with a coating rod moving by a mechanical robot in the X direction (back and forth). The cylinder is 300mm in length, 19mm in diameter. What is the distance traversed per revolution of a rotating cylinder, with the lathe rotating at 1200RPM...
  9. C

    Centripetal Acceleration metres per second squared

    Homework Statement What is the magnitude of the centripetal acceleration of a point on the circumference of a 0.32m radius bicycle wheel rotating at 22 rad/s ? Give your answer in metres per second squared Homework Equations To be honest I am stumped I have no idea The Attempt at...
  10. A

    Incorrect dilution values per text implications.

    Homework Statement Volumes of 1, 5, 10 and 15mL .0024M K2CrO4 are added to separate flasks and then filled with enough .25M NaNO3 to make 100mL of solution each. I'm asked to calculate the [CrO4^2-] per flask. I assume that all of the K2CrO4 will dissociate and, since there is only 1mol...
  11. T

    How Many Revolutions Does a Turbine Make When Coasting to a Stop?

    Homework Statement An electric-generator turbine spins at 3460.0 rpm. Friction is so small that it takes the turbine 14.9 min to coast to a stop. How many revolutions does it make while stopping? (Do not include a unit with your answer.) Homework Equations rev/min * 1min/60sec =...
  12. C

    Energy per particle of polarized electron gas

    Homework Statement Calculate the total internal energy per electron at zero temperature of a free noninteracting gas of electrons of density n, in the following two cases. a) First assume that states with both spin directions are populated equally. b) Now assume that the gas is fully...
  13. D

    Hours per Week as Math Ph.D. Student

    Hi, I asked a question about a week ago -- and didn't receive a response, so I'm trying a perhaps easier question. :) About hour many hours per week should one expect to spend earning a Ph.D. in Mathematics? Thanks, David
  14. N

    Products of rations to convert meters per second to miles per hour

    Homework Statement Which of the following products of ratios gives the conversion factors to convert meters per second (m/s) to miles per hour (mi/hr) Homework Equations a. [5280f/mi] x [12 in/f] x [2.54 cm/1 in] x [100 cm/1m] x [3600 s/1h] b. [5280f/mi] x [12 in/f] x [1 in/ 2.54 cm]...
  15. B

    Calculating the mass per unit length of a string based on the graph of f vs. 1/L

    Homework Statement The frequency of a vibrating string is set to 15, 20, 25, 30, or 35 Hz and the length needed to attain a standing wave (mode 1) is recorded. A graph of frequency versus 1/L is recorded. Calculate the mass per unit length of the string. The resulting graph has the...
  16. L

    What does per second per second mean?

    thrust is the ability to move a 1 pound object at 32 feet per second per second. What does per second per second mean? Does that mean for every second, the object has moved 64 feet in a given direction? if air molecules are moved at 3200 feet per second per second to deliver 100 pounds of...
  17. K

    Average beauties per human groups

    This is what you get if you compile numerous attractive females and then take all their features to come up with archetypal faces that is supposed to best represent the group they belong to.
  18. A

    Acceleration: Meters per second per second

    I'm can picture acceleration but when it comes to the quantity of acceleration (meters per second per second) I'm lost. I just need a simple explanation of what m/s/s means.
  19. R

    Standard cubic meter per minute

    gas flow rate has units of "sccm" that standard cubic centimeter per minute. what does "standard" means here? how is derived? if there is gas flow of 1 sccm then how much gas flows in cubic meters?
  20. Y

    Lasers - energy per round-trip

    Hi all, I would like to ask a question regarding lasers and resonators: If I have a solid-state laser, and I know the following information: The gain medium diameter, it's length, population difference between the energy levels, gamma-alpha (r-a), broadening, wavelength, spontaneous...
  21. M

    Perfect gasses temperature vs kinetic energy per molecule

    Homework Statement I have been wondering about temperature and it's relation to kinetic energy I didn't study thermodynamics so I hope that replies could be simplified.I am trying to think about the perfect gas law to relate kinetic energy per molecule to temperature, and I want to know if I...
  22. H

    How many hours do you work per week?

    Just wondering.
  23. M

    Which of these have higher output per square unit*, phototransistors,

    Which of these have higher output per square unit*, phototransistors, photodiodes or APD photodiodes.?
  24. A

    G of CO2 per kWh from burning methane

    http://europe.theoildrum.com/node/6638" has a chart that claims that the burning of methane yields 360 g of CO2 per kWh of energy released. I decided to check that, but I'm not getting the same answer they suggest. Here's what I did: CH4 + 2O2 = 2H2O + CO2 -74.87 + 0= 2*-285.83 + -393.509...
  25. S

    Converting parts per million (ppm) and mol of ions

    1. Fluorine compounds are added to water, the concentration being 0.90 ppm. a. What amount of fluoride present 1.0g of water? Solution- (just need to know what the number mean) Divided 0.90 pm by 1,000,000, which I assume is the grams of substance per kilogram? Then divided that...
  26. G

    The minimum number of photons per second?

    Homework Statement An owl has good night vision because its eyes can detect a light intensity as small as 4.5 10-13 W/m2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 7.5 mm and the light has a wavelength of 503 nm...
  27. n.karthick

    Energy required per day for survival by an individual

    I want to know how much energy is required by an average individual per day for his survival, assuming he is doing normal work. is there any rough estimate? (say some thousands of joules !). I like to know this rough value and I want to convert this is to electrical equivalent (i.e, in kWhr). In...
  28. H

    Force Per Length and Magnitude of a Current

    Homework Statement 1.A long, thick (cylindrical, solid) wire of radius 3 mm carries a total current of I1 = 100A that is uniformly distributed over its cross-sectional area. The current is in the +z direction. A second, thin wire runs parallel to the axis of the thick wire and is located at a...
  29. T

    How Many Photons per Square CM Does it Take to Register a Reaction in Vision?

    I was just looking at a light source from a few miles away obscured by several trees and thought "wow, that's pretty bright for such a small light (an airplane's flash) to register from such a distance". So, a small flash travels, say two miles, hits a small opening, say two or three inches...
  30. V

    Unleashing 1.8MJ in Just 1ns: The NIF's Power Per Pulse

    Homework Statement The NIF will use extremely powerful lasers to attempt to implode a D-T target and thus initiate nuclear fusion. One pulse of the lasers will only last for 1 nanosecond, but the total energy is expected to hit 1.8 megajoules. The wavelength is in the near ultraviolet, 350 nm...
  31. M

    Apollo 11 launch at 500 frames per second

    http://www.petapixel.com/2010/04/26/apollo-11-launch-at-500-frames-per-second/ High speed footage of the Saturn V's engines starting and lift-off with a very informative technical commentary.
  32. M

    Calculating Annuitized Capital Costs per kWh

    Dear Physics friends! I would be very grateful if you could help me. I am currently working on my master thesis and I have the following question: The overall annuitized capital costs of a distribution grid amount to: 900 USD per kw and year. How do I get the costs per kwh? Thanks a lot...
  33. T

    Number of electrons per unit volume

    Why is the number of electrons per unit volume , n fixed in a conductor regardless of the temperature while its not in semiconductors ??
  34. E

    How do you calculate activation energy per vacancy?

    the question is like this: Calculate the activation energy needed to create a single vacancy in aluminium, given: T= 500 Celsius Density (500 Celsius) = 2.62 gr/cm3 n = 7.57e23 m-3 Mw (Al) = 26.98 gr/mol I know these Formulas: n = N*exp (Q/kT) (k = boltzmann's constant) N =...
  35. A

    Proving turns per length on a solenoid

    Homework Statement Prove that the number of turns per length on a solenoid is equal to 1/(diameter). Homework Equations A= 2(pi)(R) The Attempt at a Solution number of turns= length/(2pi*radius) number of coils per length=(length/(2pi*radius))/length number of coils per...
  36. Y

    Force per unit length of wires-

    Homework Statement Two wires have current both running in the positive x direction as shown in the diagram with I1 = 13.9 amps and I2 = 4.5 amps. They are separated by a distance of d = 4.7 meters. A third wire with I3 = 10 amps is placed somewhere between the two wires with current running...
  37. T

    Number of protons and neutrons per shell?

    before i start i wanted to make it clear that this is NOT homework. its just a quick question which puzzled me and my friend In the shell model of the nucleus. i found a statement that said that since both neutrons and protons are fermions, there are restricted to 2 of each at each energy...
  38. X

    How many 420nm photons are emitted per second by an LED with a power of 10 mW?

    Homework Statement An LED emits a light beam with a power of 10 mW. The wavelength of the light is 420 nm. How many 420nm photons are emitted per sec.? Homework Equations E=hc/lamda is 2.95E-9 P/E= Photons emitted per sec. (10*10E-3)(2.95E-9)=2.952E-11 The Attempt at a...
  39. L

    Studying Would you say that 28 hours per week is enough studying time (13 units)

    If a student spends roughly 28 hours per week studying, and has 13 units , would you say that this is enough study time for the average person? With classes that are math, science related. This pertains to a student at a 2 year college? Do you believe it would it be different for a...
  40. R

    Minimum number of relays per h-bridge

    Hi experts, :cool: Is it possible to form a h-bridge using 2 spdt relays? What i can find on the net are h-bridges using 4 spst relays or using other types of relays. sincerely Ramone
  41. N

    Calculate the capacitance per unit length of the cable

    Homework Statement The coaxial cable from a television or other device has an inner conductor with diameter of 1 mm and the shield of diameter 5 mm. Assume a plausible value for the dielectric constant (3 ≤ κ ≤ 5) of the dielectric separating the two conductors and calculate the capacitance...
  42. K

    Exploring Decrease in Binding Energy per Nucleon in Heavy Nuclei Like U-235

    Homework Statement . Why does the binding energy per nucleon decrease with increase in mass number for heavy nuclei like 235 U? Homework Equations The loss in energy of the nucleons when they move from an unbound state to a bound state is the binding...
  43. K

    Binding energy per nucleon for atoms of low mass number

    Could someone please explain to me as to why the binding energy per nucleon is lower for atoms of low mass number as compared to the atoms in the middle zone of the binding energy per nucleon versus mass number graph? My conceptual issue lies in the fact that when the mass number is low the...
  44. Chiclayo guy

    20 Liters per cubic meter of rain?

    20 Liters per cubic meter of rain? A weather report for Chiclayo Peru said we received 20 liters per cubic meter of rain yesterday. How many inches of rain would a New York weather report say we received? Thanks. Tom
  45. L

    Programs How many hours per week do you (or did you) study for electrical eng. degree

    So to the students or former students who are in electrical engineering majors, how many hours per week outside of class do you study? Or did you?
  46. I

    GM tube question to obtain number of disintegrations per second

    Homework Statement A point source of alpha particles, a tiny mass of the nuclide Am (atomic number 95, mass number 241) is mounted 7cm in front of a GM tube whose mica window has a receiving area of 3cm2. The counter linked to the GM tube records 54000 counts per minute. Calculate a. the...
  47. P

    Theory of Electron String: Vibration, Parameters & Length

    Does the theory say that an electron is a single vibrating string? How many parameters are needed to describe that string? Does the theory say how long the string is?
  48. G

    What is the Average Physical Work Output per Person in a Specific Time Frame?

    I realize that there are numerous factors to be considered when attempting to calculate something like this as no two people are alike, work environments differ, etc, but what I am trying to find out is roughly even, how much physical work (FxD=W) an average person can do in a specific time and...
  49. J

    How to write that per that in mathematical terms?

    How to write "this per that" in mathematical terms? What is the mathematical equivalent of saying, for example, meters per second? If we want to say that something moves with the rate of 50 meters per 30 seconds--do we write this as a fraction or as an equation, or we can write as both? I...
  50. B

    What is the speed of hair growth in m/s?

    I'm looking at a multiple choice test here and here's one of the questions Q.) Your hair grows 5mm per week. What is its speed in m/s? I calculating everything to appropriate units and got time = 604800 seconds length = 0.005 metres then to get the rate of metres per second I divided 0.005m /...
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