Per Definition and 565 Threads

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. 5

    Looking for pipe flow information in cubic feet per minute.

    Does anyone have a chart of what a straight pipe flows in cfm? Like 3 inch inside diam.? 4 inch? Etc? Thanks:)
  2. mattmns

    How many hours do teachers work per week?

    My intuition is wrong on many things, so I thought I would throw this question out there to see what everyone thinks. And hopefully some people with teaching experience will respond (of course everyone is welcome to respond). On average how many hours do full-time teachers (high school or...
  3. T

    Safety question: joules to pounds per square inch

    Hi there, I am the administrator for an airsoft group based out of the Chicagoland area. Many of our members currently use mesh safety goggles of the sort used in arboriculture, wood chipping, and concrete cutting. These goggles do not have a specific impact rating (though the manufacturer...
  4. W

    Calculating 3.0 Coulombs Per Second in Amps

    Homework Statement What is the value of 3.0 coulobms per second in Amps? The Attempt at a Solution amps are coulombs per second, so its just 3 right? I just want to make sure this isn't some kind of trick. thanks for any input.
  5. E

    Mass per Unit Length of Violin Strings

    [SOLVED] Mass per Unit Length of Violin Strings Homework Statement Each string on a violin is tuned to a frequency 1.5 times that of its neighbor. If all the strings are to be placed under the same tension, what must be the mass per unit length of each string relative to that of the lowest...
  6. B

    What is the entropy increase per kilogram

    Homework Statement Suppose a power plant delivers energy at 9.7E2 MW using steam turbines. The steam goes into the turbines superheated at 665 K and deposits its unused heat in river water at 298 K. Assume that the turbine operates as an ideal Carnot engine. a. If the river flow rate is...
  7. D

    Lux Lumens and Watts per square meter

    Homework Statement I am looking for a conversion factor that will ultimately get me from units of lux (illumination) which is a weighted scale of light intensity, to watts per square meter, which is not weighted. Homework Equations None availiable The Attempt at a Solution I am...
  8. J

    High voltage batteries, not 2V per cell

    Most batteries have a low voltage output like a lead acid +- 2.2V per cell And carbon + zinc have something like 1.5V and so it goes on. Can a battery have a high output voltage without putting it in series Example: I want a battery with 100V DC output per cell, does that exist or not...
  9. H

    Calculating Power from 1800 N-m of Work Per Minute

    Homework Statement What is the power of a machine that does 1800 N-m of work per minute? Homework Equations KE = m*v^2/2 V = sqrt(2KE/m) The Attempt at a Solution I don't know what N-m are... so I'm not sure what to do..
  10. P

    How Much Butane is Needed for 33440J of Energy? Combustion Equation and Solution

    Homework Statement The combustion of the fuel gas butane is given by: 2(C4H10) +13(O2) --> 8(CO2) + 10(H2O) del(H)= –5760kJ/mol What mass of butane would be needed to produce 33440J of energy? Homework Equations The Attempt at a Solution First of all how do you interpret...
  11. M

    Cycles per instruction question, why different CPI when I change for loop order?

    Hello everyone, this is a computer science/computer engineering problem... I had the following file that multiplies 2 matrices together, with 100 elements and puts it into a 3rd 100 element matrix. Well I used Simple Scalar to anlayize the CPI generated by the code and it also records the miss...
  12. A

    Electricity and revolutions per second

    Hi, Homework Statement In a simple model of the hydrogen atom, the electron moves in a circular orbit of radius 0.053 nm around a stationary proton. How many revolutions per second does the electron make? Homework Equations F = (kq1q2)/r^2 = (mv^2)/r v = wr The Attempt at a...
  13. DaveC426913

    Where Can I Find Authoritative Sources for International Volume Units?

    I'm editing a school textbook and have suddenly discovered at the 11th hour that there is a difference between the U.S. cup (236ml), the Canadian cup (227ml) and the British cup (284ml) as well as conflicting results (such as Wiki) that define them differently again - U.S.=250ml, Canadian=240ml...
  14. X

    Bariometric formula in Statistical Physics (particle density per unit volume)

    Hi there. In my homework, I had to calculate the variation of the pressure with the altitude for a classical gas. I know that I should calculate the density of particles per volume element. I found this pdf on the net (http://cannoli.mps.ohio-state.edu/phy847/phy847-p2.pdf) . If you see...
  15. wolram

    How much do you spend on clothes per year?

    How much do you spend on clothes per year? looking through my wardrobe this morning i realized all mine are ancient, the only whistle and flute i had died of moth bite years ago, it seems i only ever buy socks.
  16. S

    How Fast Should the Centrifuge Spin to Separate Red Blood Cells?

    A sample of blood is placed in a centrifuge of radius 19.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10-11 N. At how many revolutions per second should the centrifuge be operated? I converted 19cm...
  17. K

    What is the speed of the car in metres per second?

    Hey everyone, Just wondering if anyone could help me with my physics homework. It's my first time ever doing physics and I was always terrible at maths. It needs to be in soon so I'm kind of freaking out :frown: If anyone could either show me how to answer these questions or even pm I'd be...
  18. Loren Booda

    DNA and RNA symmetries per the origin(s) of life

    Does the single-handedness of DNA and RNA indicate that life originated few times, if more than once? What might the sameness between early sequences (in bacteria, say) indicate in this regard?
  19. S

    In 1/2mv^2, is m grams & v ft per second?

    I understand that the energy is in joules (?), but unsure of mass and velocity formats. I am trying to calculate the energy of an impact. Specifically, the heat energy (btu) resulting from various bullet impacts. Feel free to ask further questions if you need to know something else to answer...
  20. T

    Revs per min from metres per second

    okay so here is the problem and here is wat I did! I am just tryin to study up for exams now... and this is one of the problems! A sample of blood is placed in a centrifuge of radius 17.5 cm. The mass of a red corpuscle is 3.00×10-16 kg, and the magnitude of the force required to make it...
  21. JamesU

    Fixing 10 Popups/Sec & Internet Issues

    So I start getting about 10 popups per second(popping up in IE, which I thought I had deleted) so I go to my computer, and I have at least 20 files that are certainly spyware. I'm able to delte al but 2, but the other ones I don't have access to I restart the computer in safe mode and I...
  22. Amith2006

    Heat loss per unit area per hour

    Sir, A man covers his body with a blanket of thickness 4 mm. His temperature is 37 degree Celsius and that of the atmosphere is 27 degree Celsius. If the coefficient of thermal conductivity of wool is 1.2 x 10^(-5) W/m.K , what is the heat lost per hour per square meter area? I solved it...
  23. K

    Entropy per unit mass question (ds)

    I'm attempting to answer these thermodynamic quesions about entropy. It's been years since my last thermo course so knowledge is cloudy. If I'm incorrect or missiong relevant answers, please help. a. If ds = 0, what can you say about the process? b. If ds < 0, what can you say about the...
  24. Mk

    Singapore spends $1,003 per capita on military

    Wow, who would attack Singapore? Taiwan??
  25. wolram

    Universe be determined by some average per volume temperature ?

    Could the size of our universe be determined by some average per volume temperature ?
  26. S

    If the interest rate is 15.5%, how much interest will she pay per year?

    Carmel owes $2902.40 on her bankcard. (a) If the interest rate is 15.5%, how much interest will she pay per year? (b) Interest is calculated dail at 0.04246% and charged monthly. How much will Carmel pay for a 30day month? (c)If she pays $500 off her bankcard bill on 15th July, how much...
  27. T

    Interpreting J/s and J/(s^2): Watts & More

    Just trying to interpret some units here. If J/s is Watt, what does J/(s^2) tell me?
  28. P

    Instantaneous Decay rate per unit Volume

    'A radioactive element has a 0.5 probability of decaying to a more stable element after a particular time-span T. What is the instantaneous decay rate per unit volume? In other words determine a general expression for the number of decay events occurring per unit volume between t=t1 and t=t2...
  29. S

    Are Two Flip-Flops Sufficient for a Modulo 4 State Machine?

    How many flip-flops do I need based on the following requirement? I'm thinking 2 flip-flop since each flip-flop can be a 0 or 1. So each flip-flop holds 2 states. Design a clocked synchronous state machine with two inputs, X and Y, and one output, Z. The output should be 1 if the number of 1...
  30. I

    Why do fats contain the most energy per gram?

    hi everyone I was wondering why do fats contrain the most energy per gram?
  31. S

    How many revolutions per minute is the sample making

    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 bottom of the...
  32. P

    Shooting photons 1 per second?

    We might set up an experiment at University shooting photons one per second through slits. I think this experiment was done long ago and proved that light was a wave that was everywhere in that the photon seem to trave through both slits at the same time. But I read in the Halliday, Resnick...
  33. W

    Could someone explain undulation per revolution?

    Could someone explain undulation per revolution? I would prefer to have a mathematical function defining it also if possible. Can any explain ONE also? .
  34. J

    Output of best betavoltaics per size?

    does anyone know what power output the best current betavoltaics can produce per size per volume/type/radioactivity of fuel? Are they capable of size for size equaling a normal battery? and if not what fraction of the way there? or are alphavoltaics more promising? I cannot find much of interest...
  35. BasketDaN

    Energy per Volume Crated by Best Chem. Reaction

    Could anybody tell me, in whatever units, how much energy per volume (and by mass if you know) is released by the most powerful chemical reactions?
  36. P

    Determine the power per unit area arriving at the Earth

    a) Find the total power radiated into space by the Sun, assuming it to be a perfect emitter at T = 5690 K. The Sun's radius is 7.0 108 m. (b) From this, determine the power per unit area arriving at the Earth, 1.5 X 10^11 m away. the formula for radiation is Power = (emittance...
  37. R

    Exam Problem: Rounds per minute into Megabits per second

    Hi, guys! :approve: My exam comes in one week, so I need your urgent help :cry: I found out, that one of the problems in the exam will be about convertion between rounds per minute (of a CD or HDD) and megabits per second (as reading speed). I have no idea what is the dependence between...
  38. F

    Nonrelativistic Lab-frame Velocity as a function of kinetic energy per unit mass

    Hi everyone--I'm a bit stuck trying to follow a calculation in an article (Nucl. Phys. B360 (1991) p. 145-179) regarding the lab-frame relative velocity of two colliding particles as a function of the kinetic energy per unit mass. (I'll include references to equations in the article, but the...
  39. S

    C/C++ C++ output date in number of days per year

    for example user puts in the month as 1-12 the day for whatever month and the year, which has to include leapyears leap years only occur when the year is divisible by 4 y%4==o or if divisible by 400 but NOT 100, so 2000 is a leap year but not 2100 so if somebody puts in month 1 day 1 and...
  40. JamesU

    Let's Make a Story with Four Words Per Post

    this has probably been done before, but ayway... I'll start off a story with four words. the next person who posts will continue the story with 4 more words and so on. I'll start: there once was a...
  41. Loren Booda

    News Generous George disgorges less than $1 per African

    I don't get it. Africa is the poorest continent on Earth, with a veritable panoply of plagues. The U.S., being the richest, is also the most shameful for its parsimony towards these suffering. What does this tell us of George W. Bush's charitable beliefs? The Iraq debacle consumes...
  42. J

    Part B: "150W Engine Efficiency - Heat Given off Per Cycle

    An engine with an output of 150W has an efficiency of 25%. It works at 10 cycles/s. A. How much work is done in each cycle? work=power(delta t) = 150 W * 1s = 150 J work =15.0 J per cycle **got part A correct B. How much heat is given off in each cycle? delta...
  43. S

    Barrels Per Capita: A Unit Conversion Problem

    If the annual consumption of petroleum in the US is about 23 barrels per capita, the total annual consumption of petroleum in the US is closest to: 1. 12 mill barrels 2. 240 mill barrels 3. 2 billion barrels 4. 6 bill barrels 5. 10 bill barrels I don't know what is meant by "capita."...
  44. N

    Thermodynamics work required per unit mass problem

    Having trouble with a thermodynamics problem I'm having a bit of a problem with some of the homework in my thermodynamics class. Question (Water at 20 C, 100 kPa is compressed isothermally to 50 MPa. Determine the work required per unit mass. ) using the tables I found: State 1 T_1=20C...
  45. K

    Watts per Square Meter: Learn the Basics

    Watts per squ meter?
  46. P

    Why is the speed of light 299,792,458 metres per second?

    Can anybody explain it to me?
  47. R

    Measuring Mass per Unit Area of a Soft Blanket

    hi I'm doing a question involving the mass of a blanket ... I just need to know the following : could somebody please tell me : what it means by mass per unit area ? and for a blanket, how is the mass/unit area measured because the blanket is soft ? Roger
  48. DrChinese

    Frame Dragging Detected per GR

    From MSNBC: GR confirmed again as gravity measurements reflect the predicted space-time dragging effect caused by spinning objects. A research team analyzed millions of laser signals bounced off two satellites, called LAGEOS and LAGEOS 2. Both are highly reflective spheres not designed to do...
  49. G

    Revolutions per second question

    An electron of mass (m=9.1*10^(-31)kg) orbits a proton at a distance of 5.3*10^(-11)m. The proton pulls on the electron with an electric force of 9.2*10^(-8)N. How many revolutions per second does the electron make? This is what I did: m=9.1*10^(-31)kg v=5.3*10^(-11)m T=9.2*10^(-8)N...
  50. A

    Pressure is the change in force per unit of area

    i read somewhere that pressure is the change in force per unit of area and can be represented as the derivative P(A) = dF/dA but in order for it to be the derivative shouldn't it be P(A) = dF/dA lim dA -> 0
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