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. maistral

    Rate constant help for this reaction please

    So I was looking for some rate constants for a certain reaction and I found these: So I wanted to try them. The problem is, I have no idea how to correctly write the rate constants. Reactions number 1 to 6 is a no-brainer as it's simple Arrhenius. My problem is for rate constants 7 to 12. I...
  2. V

    Finding the derivative and rate of change

    I tried solving this question a few ways and this one logically made the most sense however I got it wrong and I am unsure of why. I first plugged in t=2 into p(t). p(2)=0.3(2)1/2+6.3 to obtain 6.724264069. I then found the derivative of D(p) which is D'(p)=-60000/p3. I plugged in...
  3. FutureEngineer1720

    Micromechanics of High Strain Rate Loaded Composite Media

    I would like to know some guidelines regarding this topic. The characteristics of wave propagation depend highly on the orientation of fibre (unidirectional and warp & weft arrangement), fibre volumetric fraction, relative fibre modulli etc. What is the relation of wave propagation and these...
  4. R

    Flow rate of fluid at a burst leakage in a pipeline due to over pressurization

    we have a project to how knowing the flow rate of fluid at the burst leakage due over pressured, probably to make it easier to understand i will attach some pictures of this mechanism. Picture at above is simply mechanism of pipeline system that installed vertically, with fluid is mud and...
  5. areamer02

    How do peak flow meters measure flow rate?

    I am in pharmacy school and my professor recently went over lung diseases with us. An important (and cheap) tool that many patients can use to detect whether their lung function is declining is a peak flow meter, which tells the patient how much air they are moving when they exhale with as much...
  6. jisbon

    Rate of change (ice ball melting)

    So to begin this question, I do know that volume =4/3 pi r cubed, while the surface area) 4 pi r squared. I will like to clarify some things about the question: 1) does the first sentence means dv/dt is proportional to 4 pi r squared? 2) given the second sentence how am I able to construct an...
  7. T

    Compressed air problem (pressure and flow rate calculations)

    When dealing with a compressed air system I would like to know how to make some calculations to predict pressure and flow rate throughout a system. e.g. If I have a compressor that can supply 50 cfm @ 100 psi at the source, and the air flows through a system of pipes, filters, turns, etc. which...
  8. S

    Comp Sci Calculating UART DLL and DLM contents from Baud Rate and Clock Frequency

    I understand that, Baud Rate = Clock Frequency / (16 x N) and that N = DLL + DLM when I substitute the figures to get an answer for N to be 576, how do I then convert this into the HEX contents of DLL and DLM, especially considering the maximum value for DLL or DLM is 255? I have uploaded...
  9. Z

    Comp Sci Rate of transmission in a wireless LAN

    Hi, It says that: When A transmits, it can only be heard/received by B when D transmits, only C can hear/receive from D. Ans : 2 messages/slot Please provide some reasoning for this answer. Zulfi.
  10. C

    Converting PSI Pressure Loss in a Pipe to Fluid Loss Rate

    Summary: Pipe Testing I need some help on how to calculate PSI loss to gallons per hour? We will be testing this 8" PVC line at 150 PSI for 4 hours. If the test gauge drops 10 PSI per hour, what is the formula to determine the gallons per hour lost? Thank you for your help.
  11. harishree90

    Exit flow rate in a Plate Heat Exchanger

    Hello All, I am working on a project with plate heat exchangers connected in a cascade system to heat up water connections in a huge system The Problem Statement : A boiler produces and circulates hot water at 65 degC to a Heat Exchanger and come out at 50 degC, where as the other fluid is...
  12. Izazo

    Outlet Volume flow rate from a steam turbine

    I am working Organic Rankine Cycle. I studied a number of research papers and in most of them, they have calculated outlet volume flow rate from the turbine or expander, but have not mentioned the calculations. So here are the available data; Pin = Turbine Inlet Pressure, 2.5 MPa Pout = Turbine...
  13. B

    MHB Average Rate Of Change Formula

    Is this the correct symbol to use for average rate of change: \overline{\triangle}=\dfrac{f(b)-f(a)}{b-a}
  14. T

    Flow rate of steam in power plants

    I want to know what's the flow rate (in kg/s) of saturated steam at 5 barA pressure to the turbines of a 250 kW power plant.
  15. men5j2s

    Can I calculate the flow rate of a compressed gas from pressure?

    I am using a compressed gas tank to fill an otherwise empty container, The gas tank is around 50bar and the container will be filled to 6bar. If I am using a pressure transducer to determine when the container has been filled to 6bar, can I use the information I gain from it to derive the flow...
  16. H

    B Which rate of Universe expansion are we currently using?

    The rates I've come across are 67, 71 and 74. Obviously it's not 74 as it was just announced. Is it one of these other numbers, something else? I'm only asking out of curiosity.
  17. C

    B Universe rate of expansion: speeding up or slowing down?

    A basic question... The further a galaxy is from ours, the more redshift, the faster it is moving away from us. This is taken as a sign the universe is expanding at ever increasing rate. Yet... As we look farther out into space, we are also looking back in time. If the farther we look back in...
  18. H

    B Rate of the expansion of the Universe and the Big Bang

    Disclaimer: I am parroting the information in this from articles that I've read. This post is to try to get a better understanding of what they are talking about and if any of it is relevant. I came across an article regarding the Big Bang while looking into the current rate of universe...
  19. akin-iii

    I How do I derive a PDE for the volume flow rate of a tilting vessel?

    So the other day, I was pouring beer from a can to a mug and I obviously know the flow rate depends on the height of the beer from the bottom of the can (fluid level in the vessel), angle of tilt and I think time as well. I was wondering how to best model the PDE to describe such a phenomenon (...
  20. J

    Torque required at the wheels to accelerate a vehicle at a certain rate?

    I'm struggling to understand something basic here. If I have a just a wheel, with mass 10kg, and radius 0.25m, and I specify that the CG is accelerating linearly at 1ms-2, how do I calculate the force needed to do this? Using F = ma gives 10N, but using this value for torque calculation on the...
  21. P

    How to solve this sound problem (minimum sampling rate required)

    Summary: The problem: If one wants to make a digital record of sound such that no audible information is lost, what is the longest interval, Δt, between samples that could be used? ( it gives a hint that humans can hear sound waves in the frequency range 20 Hz to 20 kHz. It should be a very...
  22. LoveScience

    Dialysate flow rate when pulling through a jug

    Friendly argument at work (both non physics majors) with what tube would fill up faster with a flow rate (siphon like) that remains the same through two different diameter tubes. The dialysate jug is open to atm pressure. One tube is about .5 inches in diameter and the other is .25. We were...
  23. felipeborges

    Estimating the Evaporation Rate

    So I must define the problem stated above. I must define the variables and the error associated with each one of them. Any Formula, Articles, Insight would be of great help! Thanks in advance.
  24. N

    I Impact of atmospheric turbulence on secret key rate in QKD

    I have the calculation on secret key rate over the turbulence channel using Python code. The calculation is as below: import numpy as np import math import re import random import cmath #import itertools from math import pi,e,log import time #import xlwt import matplotlib.pyplot as plt from...
  25. Brendan Webb

    Flow Rate and Temperature Relationship in Air Change Calculations

    MODERATOR'S NOTE: NO TEMPLATE BECAUSE THREAD WAS SUBMITTED TO ONE OF THE REGULAR FORUMS Summary: Calculate the air change rate required to keep a certain temperature In question d above, you were asked to calculate how long the air flow in the system would be active in a day. Now factor in...
  26. K

    Finding the average water mass flow rate in a water rocket

    Could anyone kindly kind me as to where this formula is derived from and how, because I searched and can't find it anywhere
  27. P

    Finance loan interest rate homework

    I got 6.33% but apparently it's 3.2%
  28. amare

    How to calculate the flow rate?

    A valve is installed between the throttle body and intake manifold and decrease its area to restrict the flow. How do I analyze the mass flow rate of air in the decreasing area to know the engine working condition at a minimum valve area?
  29. lamejane

    EPVD: Effect of changing the Thin-film Metal deposition Rate

    Hello Material experts out there ! I would like to test a reduced deposition rate for Ni ( 0.3 nm/sec reduced to 0.1 nm/sec) to avoid metal splashes and stabilize the process. This would for sure increase the deposition process time but I'm not quite sure of the Microscopic effects of such a...
  30. T

    Finding Velocity of Water Flow: A0 to A

    a) so Q=V/t = Av Q is constant ( same At A0 and A). That means I have to find the velocity of the water either at A0 or at A. But how can I find it? I thought there must be a reason that h is given but the only way I can use it is to assume the velocity is 0m/s at A0 but actually it is not...
  31. DavidCummings

    I Does the newly measured expansion rate change the odds for Big Rip?

    Is the likelihood (or unlikelihood) of a Big Rip changed by the new findings of faster universe expansion (https://www.sciencedaily.com/releases/2019/04/190425104128.htm). In https://www.physicsforums.com/threads/will-the-big-rip-basically-be-the-big-bang-for-the-next-universe.971039/, phinds...
  32. J

    How to find the decay rate of processes: a→ b+c

    As mentioned above I'm unable to begin because I don't know the relevant equations or method.
  33. Nic sign

    How is mass flow rate a force?

    Lets say if I have a pipe with one end closed, and drill a small hole on the side of the pipe near the closed end. Then I use vacuum at the open end to create mass flow exiting the pipe. Where is the opposite force on the pipe? [crackpot youtube video deleted by moderator @russ_watters ]
  34. B

    MHB Rate Problem: How many minutes does it take 14 people to paint 14 walls?

    It takes 28 minutes for 7 people to paint 7 walls. How many minutes does it take 14 people to paint 14 walls?
  35. WhiteWolf98

    Fluid Mechanics: Flow rate required to achieve a constant height

    Some thoughts that I've had on the question are saying the volume flow rate (##Q##) in, must equal the volume flow rate out. If that's the case, then: ##Q_{in} = Q_{out}## ##A_1V_1=A_2V_2## But... no areas have been given. And height doesn't enter this equation at all. Then I thought it...
  36. N

    How would we increase the rotation rate of very large structures in deep space?

    Imagine a 400-meter-long pipe with a 1600-meter diameter, floating in inter-planetary space. It is spinning at 0.5 gravity along its major axis and there are no secondary-axes spins. We need to increase rotation to 0.85 g. Its density is a uniform 2.3 kg/m³ and it weighs 49,120,056 kg. Thanks to...
  37. O

    Calculate spring rate in 3 bump scenarios?

    Hi, Working on my vehicle and have a theoretical question I'd like a 2nd opinion on. The physics question is how much influence the force of a bump has in conjunction with a perfectly tuned spring rate can have on ride quality (as crudely defined in vertical acceleration z force m/s squared)...
  38. avishay

    How to convert pressure (Bar) to flow rate (L/min)?

    hii, I'm try to calculate the pressure (in bar) needed for a certain flow rate 3 L/min of Argon gas given the following setup: - I have a tank of Argon gas and the line pressure can be between 0 bar to 5 bar. - The gas will flow out to the open air in the end. - My pipe has an internal radius...
  39. C

    Rate of change of area with deformation

    Could I please get a hint on how I should start this question/how I should parameterize these variables? I'm going to head to sleep as I am from the eastern time zone. I apologize ahead of time for my delayed reply.
  40. H

    Find an expression for the power developed at the given rotation rate

    So for part (a), I used the fact that 1/N = the period = T. I solved for the velocity, where i got v=2πRN. I plugged that v into F=(m v^2)/R, which is the centripetal force, but also the force of friction. My answer to part (a) is 4(π^2)mR(N^2). I'm a bit confused on part (b). I know that...
  41. G

    Solving for Thickness of Lead to Reduce Count Rate to 50

    Homework Statement The count-rate from a gamma source is measured to be 1000 counts per minute. When 1.0 cm of lead is placed between the source and the detector, the count rate is reduced to 100 counts per minute. What additional thickness of lead would have reduced the count-rate to 50 counts...
  42. Roy S Ramirez

    How can I predict the flow rate for a real life water hose?

    Hello! I hope you are all doing well! I've been always intrigued by fluid mechanics and decided to try out a quick experiment with my water faucet. After using some equations I found online [1] [2], I plugged a hose to the faucet and let the water run. I filled a 1 quart bowl and recorded the...
  43. sophiecentaur

    Absorption rate of CO2 in water

    So here's an interesting topic and I would appreciate some input from the assembled brains of PF to the question. Unfortunately I can't reveal the background to this but I want to know something about the rate that small bubbles of CO2 are likely to be dissolved in water under moderate pressure...
  44. DrClaude

    Mortgages: fixed vs variable rates

    I don't know how things are changing globally, but over here the bank rates are slowly going up. In conjunction, I've been reading articles from my bank that say that it would be a good time to go from a variable-rate mortgage (where the rate is adjusted every 3 months) to a fixed-rate mortgage...
  45. gibberingmouther

    G-Force Tolerance and Heart Rate

    This is about my tabletop game again. Hypothetically speaking, if your heart rate was faster because of an "altered time rate" - anywhere from X2 to significantly more than that times the normal time rate - would that increase your g force tolerance? I'm speaking mainly about a g-force...
  46. M

    Rate constant calculation Using the Arrhenius equation

    Homework Statement A reaction has a rate constant of 0.0117/s at 400.0 K and 0.689/s at 450.0 K. What is the value of the rate constant (to 1 decimal place) at 538 K? Homework Equations ln k= ln A-E[a]/RT The Attempt at a Solution I'm not sure how to approach this problem, although I know...
  47. S

    Rate of emission of alpha particle in uranium decay

    Homework Statement U - 238 is undergoing alpha emission into Th - 234. U - 238 has half – life of 109 years. Calculate the emission rate of alpha when uranium has mass of 10 grams Homework Equations A = λN A = A0 (1/2)n , n = t / half - life The Attempt at a Solution Not sure how to do it but...
  48. D

    Determining the flow rate for a cooling system

    MODERATOR'S NOTE: HOMEWORK INCORRECTLY POSTED TO CLASSICAL FORUM, SO NO TEMPLATE I need help with the following question: Please have a look at the question and my attempt at the solution. Alternative cooling systems are considered for a large computing centre requiring 1 MW of cooling...
  49. Y

    Determine the rate of a reaction

    Homework Statement Homework EquationsThe Attempt at a Solution I need to know the time it takes for the [H+] concentration to be 0.15mol/L. However, the graph gives me the [I2] concentration over time, and I don't know how to convert it to the [H+] concentration. How should I solve the...
  50. B

    I Atmospheric Lapse Rate (calculating the altitude of cloud formation)

    This is probably more of a p-chem question but I figure you guys are smart enough to answer this. FREEZING LEVEL CALCULATION: Per FAA "A standard temperature lapse rate is when the temperature decreases at the rate of approximately 3.5 °F or 2 °C per thousand feet up to 36,000 feet" Easy...
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