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

    Understanding Potential Difference: Work Done per Unit Charge?

    I learned Potential but could not understand what Potential Difference is. Some define it as Work Done per unit charge. I am confused what per unit charge is. Does that mean electrons or protons ? As much as I know, electric current is the flow of negatively charged electrons to the positive...
  2. B

    The human process 11 trillion bits per second

    I'm trying to figure out how many bits of information the human has stored in his mind. I personally believe that information is not stored in atoms in the person's brain but is stored in an immaterial realm and the information is not made of material. We can talk about whether or not that's...
  3. L

    Why is the binding energy per nucleon lower for lighter nuclei?

    From the graph plotted between Mass Number and Binding Energy per Nucleon, we infer the BE/A is stable for mass numbers between 20 and 60 (approximately) and decreases for A>60. Similarly the BE/A is very less for lighter nuclei, say, Helium. Nuclear forces are short range forces. So it is...
  4. J

    New Video on One trillion frames per second camera

    New Video on "One trillion frames per second camera" Here is the video: Mods, please delete if there is already a thread for this. I think this is a great achievement by the researchers. It's an interesting topic, so maybe people can use it to ask questions on how/why it works, and...
  5. J

    Power distribution - Per unit question problem

    Hi, exam question: My doubts start where it comes up with: S=75(0.8-j0.6) and Vr = 0.97 p.u. Its easy to determine that 75 comes from 60/0.8, but where is the part in the brackets coming from ? Also how was the 0.97 determined ? Thanks in advance.
  6. K

    Light Pulse Travelling Through A Water Bottle (trillion frames per second)

  7. Z

    Bernoulli equation in terms of energy per unit volume

    dear PF.. what is the Bernoulli equation in terms of energy per unit volume the equation include the 1) static pressure 2) hydrostatic pressure 3) dynamic pressure 4) stagnation pressure
  8. N

    Chemistry How do you find the enthelphy change per mole of magnesium?

    Homework Statement In this calorimetry experiment, O.5 grams of magnesium is dissolved in 100.0 ml (100.0g) of diluted HCL (0.1mol/L) at an initial temperature of 29.50 C. The final temperature is 46.18 C. Q: Calculate the enthalpy change per mole of magnesium. Homework Equations...
  9. T

    Related Rates of Change Per Unit Time

    Homework Statement In the special theory of relativity the mass of a particle moving at speed v is given by the expression m/(1-(v2/c2)) where m is the mass at rest and c is the speed of light. At what rate is the mass of the particle changing when the speed of the particle is (1/2)c and is...
  10. A

    How to write joules per metre squared per second

    This was a question I had in another post, but the main topic was on a similar but different issue... If I had the dimensions joules per metre squared per second (e.g. like for a solar panel), how would I write that? I've been told \frac{Js}{m^2} But I get \frac{J}{m^2s} Why is it...
  11. N

    Heat of rxn per mol H2O formed in acid-base reaction

    Homework Statement Calculate the heat of reaction per mole of water formed in the acid-base reaction. Assume that the total mass of the solution is 150g. 75mL of 2.0M NaOH added to 75mL of 2.0M HCl in a styrofoam cup. Average initial temp = 295.65K. final temp = 308.8K Homework...
  12. T

    Total energy per unit area of a EM pulse

    B=Boexp[-(kz-ωt)2)] i(hat) Calculate the electric field associated with the above magnetic field pulse. Calculate the Poynting vector for the EM field and the total energy per unit area. Use Maxwell's equations in vacuum and assume electric potential is zero. Homework Equations...
  13. P

    As per Japanese physicist (Masahiro Hotta), energy teleporation is possible

    http://www.tuhep.phys.tohoku.ac.jp/~hotta/extended-version-qet-review.pdf In the link above and by searching net with "Masahiro Hotta", anyone can find papers written by him on energy teleportation. As per Hotta, energy can certainly be transported from Point A to Point by entanglement and at...
  14. T

    Unit confusion; RPM and Strokes per minute.

    I know power = Torque x angular velocity (rad/s) AND I am wondering if angular velocity can be calculated through strokes per minute? The product is a reciprocating saw (not orbital). In this case are RPM's the same as SPM'S? Thanks
  15. J

    How much heat per second does a runner gain just from radiation?

    Homework Statement When jogging strenuously, an average runner of mass 68kg and surface area 1.85m^2 produces energy at a rate of up to 1300 W, 80% of which is converted to heat. The jogger radiates heat, but actually absorbs more from the hot air than he radiates away. At such high levels...
  16. A

    Calculating distance per 1-sec interval for plot graph d vs t

    2 travelining in a straight line initial velocity is 14m/s, at a constant acceleration of 2.0m/s^2 to a velocity of 24 m/s a) how much time to reach velocity of 24m/s t= v-v0/a or 24-14/2= 5 seconds b) distance covered by car in this process? d=v0(t) + 1/2(at^2) or...
  17. G

    Calculating maximum amount of water vapor per unit volume

    Homework Statement Compute the maximum amount of water vapor per unit volume that air can hold at the surface, where Ts = 288 K, and at a height of 10 km where T = 220 K. Express your answers in kg m-3. Homework Equations e_{s}=Ae^{\beta T} e=\rho _{v}R_{v}T The Attempt at a...
  18. A

    Find Expected Number of Cakes per Person: Bernoulli to Gamma

    Solve this?? There are w cakes and n people. The cakes are distributed to people randomly. Find the expected number of cakes a 'i' person can receive. The distribution is: a) Bernoulli distribution b) Binomial distribution c) Poisson distribution d) Uniform distribution e)...
  19. C

    Phyiscs, finding components with per. line

    Homework Statement You are given vectors A= 5.1 { i } - 7.0 { j } and vec B= - 3.8 { i } + 7.3{j}. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of vec C with vec B is 16.0. Find the x -component and y-component of vector vec C Homework...
  20. F

    Chair-lift at constant speed: confusion over passengers per minute, power, etc.

    Homework Statement A chair-lift runs at constant speed. Each passenger starts from rest at the lower station, and is delivered to the upper station with the speed of the lift. The lift raises 30 passengers a minute, of average mass 75 kg. The top of the lift is 300 metres higher than the...
  21. E

    Convert deiner to lb(f) per mile

    I am fairly certain I am doing it right, but I want to double check. Homework Statement "If you have a 25 denier string, what is its weight in pound-force per mile?" These aren't so much as equations, but conversions. Homework Equations 1 Denier = 1g per 9000m 1g = 0.0098066 N...
  22. T

    Radius of gyration/power/rev per minute

    Homework Statement A water wheel rotates a generator producing power from vertically flowing water onto its blades. Height of water is 100m above blades. init vert velocity is 0. I have calc velocity at hitting wheel as 44.3m/s calc the mass of water hitting the wheel per second to create...
  23. W

    Water temperature change per minute

    I need to know how much the water temperature will change in a PVC pipe. I have a 1.2m long PVC pipe filled to 1 meter of water. The inside diameter is 12 inches and the outside diameter is 13 inches. I have a plastic end cap on the bottom and the pipe stands up vertically. I keep it in a 20...
  24. B

    Is it watt per second or watt per hour

    Say I have a device (Thermoelectric generator) that "generates power" at 4 watts, as per watt meter reading, is it producing 4 watts a second or 4 watts an hour. I say it is producing 4 watts a second but my brother in law says 4 watts an hour so the watt meter can tell the future. Please bear...
  25. T

    Piston moving 1m per hr, how to power a generator?

    hi, thank you for taking the time to read my post, im looking at how to convert the force from a piston moving at approximately 1 meter per hour into electrical power via generator, any ideas appreciated the piston will be slow moving but generate an extremely large force, its a question...
  26. Y

    Open organ pipe what does 6 beats per second mean?

    Homework Statement You are playing a note that has a fundamental frequency of 428 Hz on a guitar string of length 56 cm. At the same time, your friend plays a fundamental note on an open organ pipe, and 6 beats per seconds are heard. The mass per unit length of the string is 2 g/m. Assume the...
  27. E

    Can C be measured in MeV? If so is this per photon?

    Can C be measured in MeV?? If so is this per photon? Basically as the title states, can you measure C in MeV, i read ALICE was nearing Acceleration of C at 14 MeV (These numbers are what i can remember from a while ago). Then is that measure of 14 MeV for say a single atom, or does it apply...
  28. G

    Schools College Course Selection Question, Credits Per Semester

    Hello, My whole goal of going to college is to make myself as marketable as possible to employers. I'm a incoming freshmen and have to sign up for my courses. Due to taking several college courses while in high school I have reduced the number of credits for my BS down to 109. I'm going to...
  29. E

    Calculate kinetic energy/ speed per particle at given temperature

    How to calculate kinetic energy/ speed per particle (atom, ion, electron, molecule.. the AVERAGE kinetic energy stays the same, but the speed differs, as there are different masses.. ) at given temperature?
  30. D

    Calculating Average Binding Energy per Nucleon in Deuterium

    Homework Statement Calculate the average binding energy per nucleon in the deuterium nucleus. Homework Equations Average binding energy= total binding energy/mass number The Attempt at a Solution Would i first have to find the mass of the nucleus and then the difference in mass? My...
  31. maverick_starstrider

    60 frames per second video (venting mostly)

    I understand that I don't "get" the whole HD video thing but regardless, what the HELL is up with video files with 60 fps? One needs an expensive computer to adequately display such a film and for what? Is there really some dumb *** who has tricked himself into thinking he can even SEE the...
  32. 1

    Sine Wave Compress/Expand per 180

    Hello, I hope you can help me. I want to "alter" a sine wave. I would say "modulate", except that I was unsatisfied with the FM formula. Here's what I want, visualize this: 1) copy-n-paste an image of a sine wave into MS-Paint 2) select part of the image from wave top1-to-bottom1 3)...
  33. R

    Decays per second, finding mass

    Homework Statement The activity of a sample of (35/16)Sulfur with a t(1/2) of (7.55*10^6 s) is 3.52*10^5 decays per second. What is the mass of the sample? Homework Equations N=Noe^-lambda*t lambda=.693/(t1/2) No/DeltaT=lambda*N The Attempt at a Solution My attempt was to...
  34. C

    Time and relationships (or, consciousness per Martin Heidegger)

    Time and relationships (or, "consciousness" per Martin Heidegger) In this forum we focus again and again on questions about “consciousness” – and I think there’s a deep reason why the meaning of this term tends to remain so unclear. Basically what we’re trying to understand is how our...
  35. W

    The relationship between time taken per oscillation and mass

    In an experiment, a ruler is connected to the table and some weights are bounded to one end of the ruler. The ruler is then flicked and the time taken per oscillation is measured. I have plotted a graph with the data I have collected, with the mass on the y-axis and time on x-axis. The graph...
  36. Borek

    How much does two person family spend per month in US?

    Assuming you don't have to pay for a house/flat renting? I understand there is no single value, and a lot depends on the place, but I am looking for some average/order of magnitude...
  37. C

    How Do Binding Energies Compare Between Nucleons and Electrons in Deuterium?

    Homework Statement a) Calculate the average binding energy per nucleon in the deuterium nucleus. b) The energy that binds an orbiting electron to the hydrogen nucleus is 13.4eV. Calculate the ratio of the binding energy per nucleon to the binding energy per electron in deuterium. Which...
  38. H

    Earth's charge and number of its electron per sq. meter

    Homework Statement The Earth is surrounded by an electric field, pointing inward at every point. Assume a magnitude of E = 167N/C near the surface. What is the net charge on the Earth? How many excess electrons per square meter on the Earth's surface does this correspond to? Homework...
  39. D

    Is 'lb per ft' a Unit of Force or Work? Confirm & Explain Here

    So in this engineering course I do at my university called Statics, we often use a unit of lb per ft as a unit of force when calculating moments. However, I was just watching an episode of Big Bang Theory when Sheldon said something about a common mistake being when people use lb per ft as a...
  40. M

    Mass Per Unit Length: Easily Calculate

    I need to obtain the mass per unit length. Is it as simple as just mass / length?
  41. K

    Calculating Energy Per Bit from Symbols Constellation

    In general, if I have a constellation of symbols, how can i calculate the energy por bit? I think I should calculate the area of figure which is formed linking external points in the space signal and divide it for the numer of bit compose the symbols. Right?
  42. D

    Thermodynamics - Work done per unit mass

    Homework Statement A sample of dry air has initial pressure p1 = 1000 hPa and temperature T1 = 300k. It undergoes a process that takes it to a new pressure p2 = 500 hPa with unchanged temperature T2 = T1. Compute the mechanical work per unit mass performed by the sample under the following...
  43. J

    What is the meaning of luminosity per unit frequency?

    I am just trying to understand exactly what luminosity per unit frequency is. I know that luminosity (L = 4PI(r2)(flux)) is amount of energy per unit time, but not sure what it means when it is also per unit frequency. The question has a cosmic source of 100 solar luminosity, all emitted...
  44. A

    Calculating battery power life per charge over a given distance

    Hi I am trying to find out how much battery life I need to power a motor for a given amount of distance but I am struggling to make sense of it all. I know from a product I have disassembled that it has a 270W motor with 2 x 24v 24A batterys and it will travel up to 11 miles. I will be...
  45. E

    Calculate ppm of NH4+ in (NH4)2SO4 Solution

    Homework Statement A solution is prepared by dissolving 0.475g of (NH4)2SO4 in enough of distilled water and the solution is made up to 2.0 dm3 Calculate the ppm of NH4+ Homework Equations The Attempt at a Solution (NH4)2SO4 -----> 2NH4+ + SO42- 0.475/132 = 3.598...
  46. V

    Find E field for a ring of charge - Charge per length non-uniform

    I have to find the E field at all points on the z-axis for a ring of charge with radius = R. \lambda(\phi) = \lambda_0 cos(\phi) where 0 \leq \phi < 2 \pi I know how to do the problem when it is the charge per length is uniform but when I do the calculation for the non-uniform case I...
  47. D

    Calculating Frequency of Electron Orbit in Hydrogen Atom

    Homework Statement In a hydrogen atom, the electron in orbit around the proton feels an attractive force of about 8.18 × 10−8 N. If the radius of the orbit is 4.57 × 10−11 m, what is the frequency in revolutions per second? Answer in units of rev/s. Homework Equations Fc= mv^2/r (2...
  48. O

    Energy Needed Per Second to Sustain a Velocity through a Liquid

    Homework Statement Bacteria use swimming to seek out food. Imagine that the bacterium is in a region of low food concentration. For the bacterium to profit from swimming to a region with more food, it has to reach there before diffusion of food molecules makes the concentrations in the two...
  49. J

    Help finding speed in degrees of latitude/longitude per hour?

    Here is the 3 part question: Latitude and Longitude Discuss and explain the latitude and longitude measurements on the Earth. Explain what is meant by a great circle, a parallel and a meridian. Assume the Earth is a sphere with the equator circumference of 40, 075 km. (a) An airplane...
  50. P

    How to Calculate Heat Loss Per Hour Through a Glass Window Pane?

    Homework Statement A glass window pane is 2.7 m high, 2.4 m wide and 2 mm thick. The temperature at the inner surface of the glass is and at the outer surface 4°C. How much heat is lost each hour through the window? The Attempt at a Solution I have the stats on the glass like...
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