What is Rate: Definition and 1000 Discussions

The Institute for Creation Research (ICR) is a Creationist apologetics institute in Dallas, Texas that specializes in media promotion of pseudoscientific creation science and interpretation of the Genesis creation narrative as a historical event. The ICR adopts the Bible as an inerrant and literal documentary of scientific and historical fact as well as religious and moral truths, and espouses a Young Earth creationist worldview. It rejects evolutionary biology, which it views as a corrupting moral and social influence and threat to religious belief. The ICR was formed by Henry M. Morris in 1972 following an organizational split with the Creation Science Research Center (CSRC).Its work in the field of creation science has been rejected by mainstream science, but has been significant in shaping creationist thought in the United States by introducing creation science through fundamentalist churches and religious schools, and by engaging in public debates against supporters of evolution. The ICR also offers unaccredited graduate level programs in Biblical Apologetics, including a minor in Creation Research. The ICR also operates the ICR Discovery Center for Science & Earth History museum in Dallas, Texas.

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  1. F

    Water flow rate and drip surface tension

    hello i have a drip tube with water dripping and when i increase the flow rate or frequency of drips they get bigger/more massive. i see the equation mass x gravity = 3.14(tube diameter)(surface tension) my mass is changing but not gravity, 3.14 or tube diameter so surface tension must be...
  2. Teeg

    Volumetric Flow Rate through a Venturi Meter

    Hi, I have designed a simple Venturi meter to measure pressure differential across to section of the pipe as pictured. However in calculations I am not sure if I am doing something wrong. I am trying to calculate Volumetric flow rate in L/s. I am using Bernoulli Equation of the Venturi meter as...
  3. WhiteWolf98

    Calculating Discharge Rate of Fluid in Circular Area

    This is actually right at the start of another derivation, but I can't understand how the author gets the formula for ##q##. So the discharge per unit thickness is the circumference of the circle, multiplied by the velocity at that point (at ##r##)? I thought the formula for flow rate was...
  4. B

    Volume Flow Rate: Open vs Closed Valves

    Made an attempt at this Q but I'm unsure on how to do part c) or if I had even done part a) and b) right What difference does it make to the volume flow rate equation when the valve goes from open to closed? Any help would be appreciated! Thanks
  5. M

    I Failure rate for a uniformly distributed variable

    Hi, I have this question: If random variable T is uniformly distributed over [a, b] , what is its failure rate? Please help
  6. e2m2a

    B Frame Dragging Rate: Mass Proportionality?

    Curious about frame dragging. Is the rate at which frame dragging occurs proportional to mass? For example, when the Earth rotates it has been confirmed space drags with the earth. I assume the rate is very small compared to the rotation rate of the earth. However, if the mass of the Earth...
  7. E

    Rate of conduction heat transfer with different hot-side and cold-side areas

    When we measure 'the rate of conduction heat transfer'=Q , we assume that the hot side and the cold side's area are same. But if the both side's area is different to each other, how can i know the rate of conduction heat transfer? like below figure. Would you like to help me?? Thanks.
  8. S

    Chemistry Can anyone check my answers for these equilibrium problems?

    The following are my works for the problems: I put squares on my final answers! Thank you!
  9. A

    Flow rate of a pipe - calculation

    So, I actually do not know, if the formula given applies to this problem or not, so I wanted to check
  10. R

    When is the rate of change of Kinetic Energy maximum here?

    Because, ##F=ma=kv##, therefore, ##a=kv/m##. Clearly, the net acceleration ##A=-(g+a)##. Also, ##A=dv/dt=-(g+ \frac {kv} m )##, so cross multiplying and integrating LHS with respect to ##v## and RHS with respect to ##t## gives me: $$ v= e^{ \frac {-tk} m } * (u + \frac {gm} k) - \frac {gm} k $$...
  11. morrobay

    Flood drainage outflow rate from horizontal 1500m drainpipe at sump

    This 1500 m long , 2m diameter , 1m below flooded road surface from point at right side to sump at left side is horizontal. My understanding for sufficient drainage is a minimum fall, 1:100 required. Then with a gradient of .01 a pipe of this length should have a 15m fall. There is grating...
  12. B

    Compound Interest: 3.11% Annually, 3x/Year

    1. 350*(1+(0.0311)/3)*ln(1+(0.0311)/3) 2 and 3. Not sure how to answer these questions.
  13. GooseyGabe

    Does the rate of which something melts/vaporizes increases with heat?

    Something I've been thinking about recently is like how much heat would it take to evaporate an entire lake in less than a second. Or something like Tungsten Steel. The main question is does an increase in heat increase the rate of its change in structure? Sorry for the boring question.
  14. Amirul96

    Mass and Volumetric Flow rate of Natural Gas

    Hi. I am currently doing my internship in the oil and gas industry (contractor) as process engineer. My supervisor give me a task to do some reverse engineering where i need to study how a spreadsheet (calculation) construct by other process engineer was been constructed. Ok the situation is the...
  15. G

    Does inertia have anything to do with bodies falling at the same rate?

    The equation manipulation that shows that bodies will fall at the same rate regardless of their mass is very straight forward, because mass cancels when you set F = ma of the body equal to gravitational force using Newton's gravitational equation. I have no problem understanding that in terms of...
  16. J

    Engineering Sketching output waveforms while considering slew rate

    1. Using the frequency equation I know the time period is 1 millisecond. 2. The duty cycle (50%) equation tells me that the pulse width and the amplitude is 1 V. 3. Thus the input waveform looks like this : (?) 4. As the slew rate is 0.5 volts per microsecond, the output voltage would take...
  17. Franklie001

    The average rate of energy loss resulting from internal friction

    Summary:: Having the following dates:
  18. ttpp1124

    Determine what happens to the rate of change of the population over time

  19. S

    I Why is the "replacement fertility rate" not exactly 2?

    I've never understood this, and although I've had commenters give *qualitative* reasons, I'd like to get the raw mathematics on exactly this is so.
  20. ttpp1124

    Find the rate at which the concentration is changing after 2 hours

  21. O

    I What is meant by rate of change with respect to volume?

    In physics we often come across $$\rho=\dfrac{dq}{dV}$$ Does it mean: ##(i)## ##\displaystyle \lim_{\Delta V \to 0} \dfrac{\Delta q}{\Delta V}## OR ##(ii)## ##\dfrac{\partial}{\partial z} \left( \dfrac{\partial}{\partial y} \left( \dfrac{\partial q}{\partial x} \right) \right)## What does...
  22. chucho11028

    Find the rate of change of velocity

    Hello everyone, I have a problem where I have to find the final displacement and final velocity which I have found however, I want to post few variations for that same problem which I am curious. It is more for my own knowledge > I would appreciate any help Please follow graph below with...
  23. jim mcnamara

    Coronavirus infection rate + outcomes -versus bloodtypes

    https://www.scmp.com/news/china/society/article/3075567/people-blood-type-may-be-more-vulnerable-coronavirus-china-study This is a news report on a Chinese study, not a journal article Type O population of confirmed patients were disproportionately less like to die and less likely to become...
  24. BWV

    COVID >47% false positive rate on COVID-19 test?

    interesting: https://www.ncbi.nlm.nih.gov/pubmed/32133832?fbclid=IwAR3KtTRFTp9eb0aA-8ThVONEMGeGhecOnjMJtIblbClp8ufahx71HOFSWdg Objective: As the prevention and control of COVID-19continues to advance, the active nucleic acid test screening in the close contacts of the patients has been...
  25. Geith

    (Fluid mechanics) How to find the flow rate of a gas from a vessel

    I am working on a project where I have to calculate various results relating to the motion of a water bottle rocket being launched. I am currently stuck on trying to find how long the thrust period of the rocket is. The model for the rocket is as follows: It is a 2L (0.002m3 bottle filled with...
  26. Grinkle

    Interest rate cut vs health policy - how are they consistent?

    Cutting interest rates is intended to change people's behavior in favor of economic growth driving activity. In the main this necessarily involves an increased amount of leaving ones home and going to work. The novel CV itself is not impacting the economy - it is the various policies to combat...
  27. Anon_Miner

    Volumetric flow rate of a pipe

    Hello kind people of PF I am looking to mount a fan on one end of a pipe but I'm not sure how much air can the pipe transfer. (Volumetric flow rate) The pipe is vertical and 15 meters long.It has a diameter of 10 cm. I'm looking to push air from top to bottom using a fan. Need to know the...
  28. P

    Schools How would you rate UC Davis' and U.H. at Manoa's Cosmology programs?

    Not when compared to each other but compared to other programs in the country... Also, I'm looking for a comparison in terms of future career prospects in Astronomy and quality of PhDs produced... Thanks!
  29. bagasme

    Effects and Implications of 100% Income Tax Rate

    Hello all, Suppose that in a monopoly game (board game), a player passed through Go and receive $2000 as salary. Then he landed on Income Tax and he paid $2000 too. It means that he paid 100% tax rate, in other words he paid all of his salary only for the tax. What the effects and implications...
  30. WhiteWolf98

    Flow Rate (Q) of Viscous Flow between Two Plates

    I know how to derive the formula, but I have no idea how to actually use this. Where it says ##50~cm## wide, I'm not sure if that's in the x-direction or the z-direction. ##W##, the width in the equation, is in the z-direction. ##\mu## can be calculated, but I'm not sure what the pressure...
  31. DMB

    Chemistry Integrated rate law homework equations Gen Chem II

    No idea how to solve
  32. Z

    Still water droplet evaporation rate (help using Maxwell's formula please)

    So I've observed the animal I am studying dry it's self (a survival mechanism called anhydrobiosis) to avoid freezing (laseration by ice crystals). Life forms given time produce a number of protectants in order to survive. Trehalose a sugar is produced to 2-4%. This will act as an antifreeze to...
  33. bbbl67

    I How do you calculate the cool-down rate of the Universe?

    Okay, just for kicks, I was wondering how do you calculate the the rate of cooling of the universe? All I could think of is using the Ideal Gas Law from Thermodynamics: Ideal Gas Law: P V = n R T | V | volume P | pressure n | amount T | temperature R | molar gas constant (≈ 8.314 J/(mol K)) I...
  34. rzyn

    Rate of fall depends on rotation?

    v1=460m/s×2, v2=0 m1=m2=5kg R=6378km a1=460m×460m/s/s/6378/km/1000/m×km=0.13m/s/s a2=0 F1=m1×a1=0.66kg×m/s/s F2=m2×a2=0 G=9.81m/s/s F3=(m1+m2)×G=98.1kg×m/s/s (F3-F1)/10/kg = 9.744m/s/s Where the heck did I go wrong?
  35. archaic

    Dealing with Undefined Values in Calculus: A Lesson in Limits

    This is not to ask for a solution, rather I want comments on the rigor of the step. Thank you for your time! The graph shows a system of two points at ##t## and ##t+dt##, it is a bit exaggerated of course. The upper point is moving strictly in the ##x## direction and has a constant velocity...
  36. S

    Calculating the Mass Flow Rate of a boiler

    Im trying to do some past exam papers. If i can get help with the method on how to solve and have correct formulas, it will help me. I) There is one formula in the notes to get mass flow rate: Heat lost by steam = Heat taken up by water GsHfg = (GwCpw)(change in temp) Gs x 2748 x 10x103 =...
  37. B

    How Do I Calculate Heat Transfer by Conduction Using Thermal Conductivity?

    Can anyone please guide me in what I'm missing to answer part b)i? I can't seem to work out the thermal conductivity (k) in order to find the heat transfer by conduction? Or is the different approach that I must take to do this question? Thanks for any help!
  38. V

    How can the molar flow rate of a two-gas mixture be calculated?

    I have two Gases where i know the molar flow rate of each gas. Is there any way to calculate the molar flow rate of the two gases together or is it just the average of the two molar flow rates?
  39. V

    Convert Mass Flow Rate to Molar Flow Rate

    how can i convert mass flow rate into molar flow rate using density of the gas.
  40. r12214001

    Chemistry Relationship between chemical equilibrium and rate equilibrium

    Q: Is it true that the value of K depends on the amounts of reactants and products mixed together initially? Explain. A:NO, Equilibrium and rates of reaction (kinetics) are independent of each other. A reaction with a large equilibrium constant value may be a fast reaction or a slow reaction...
  41. P

    B Expansion Rate of the Universe

    I hope that I am conveying what I see in my head clearly. I guess that I am visually imagining the 3 spatial dimensions projected on the 2d surface of a sphere and as that sphere expands that the increased distance between 2 points would happen what seems like at an accelerating rate because of...
  42. X

    Measure flow rate with a manometer (pressure gauge)

    Hello! I have a volume of 50 liters which I pressurize with air so that I read 1 bar on the manometer. But there is a leakage in the volume so after 30 sec the manometer shows 0,5 bar. What is then the air flow ( liter / min) of the leakage?
  43. r12214001

    Chemistry Solve Log Rate Law Problem | Step-by-Step Guide for Optimal Results

    my question is in fig.
  44. B

    Is a Rate of 100K/s an Intuitively Offensive Way to Measure Temperature Change?

    Question: This would be the right approach to do this problem? Thanks!
  45. B

    Working out the rate of heat loss from a radiator

    Here is the Q below This is what I have tried so far. I ended up getting a value of 1772.4 watts Is this the correct way of doing this problem?
  46. Sabra_a

    Reaction rate, rate equation and half life

    Summary: Hydrogen peroxide, H2O2, decomposes as per following reaction scheme: H2O2(l) → H2O(l) + O2(g) The concentration versus time data for the decomposition of hydrogen peroxide is given in Table 1. i) Calculate the reaction rate constant, k, graphically, with the aid of Excel software...
  47. E

    Which substance does rate in a rate equation refer to?

    For instance, consider the reaction X + 2Y --> Z. Suppose the reaction is first order with respect to both X and Y. We can write that "rate" = k[X][Y]. However, we could measure the rate of reaction as the (negative of the) rate of change of [X] OR that of [Y], however the rate of change of...
  48. Z

    Accelerated Thermal Cycling: The Impact of Rate of Increase

    When ICs undergo accelerated testing via thermal cycling, wouldn't rate of temperature increase factor into the equation? For example, in Equation 4 in this pdf: http://www.issi.com/WW/pdf/semiconductor-reliability.pdf The Temp Cycling Acceleration Factor is a function of Tmax,stress and...
  49. L

    Units for Precession Rate (Ω)?

    The precession rate is given as ##Ω = \frac{Mgr}{Iω}##. What are the units here?: I'm calculating it as ##\frac{1}{rad . s}##. Am I supposed to interpret this as revolutions per second, sort of like frequency, and ignore the ##rad##? Also, period is calculated as: ##T = \frac{2π}{Ω}##. So...
  50. R

    B Universe expansion rate in m/s^2 ?

    Summary: Is it possible to tell the current average universe expansion rate i.e. acceleration of expansion in m/s^2 ? Is it possible to tell the current average universe expansion rate i.e. acceleration of expansion in m/s^2 ? If i say in relation to earth, does this make it easier to answer...
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