Rate Definition and 1000 Threads

Hi all I am trying to set up a report showing the air consumption rate of my cylinder actuators on different valves. I am stuck at the very end where I should calculate the air consumption rate. All calcs are in metric units. Okay as an example let's use the following: Valve: SKG200 with...

So I have been thinking of this problem... what is the greatest rate of angle change for a function? As in, what is the point in which a function achieves its greatest rate of angle change... Well, the angle of a function can be determined by arctan(y') The Rate of Angle change is...

Here is the question: Here is a link to the question: Calculus problem! Please help!? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

I am trying to understand the relationship between p-values and Type II error rate. Type II error occurs when there is failure to reject the null when it is false. As an example, suppose that I find that my results are not significant. In this case, the p-value is increased, or higher (in...

Hi all I am trying to set up a report showing the air consumption rate of my cylinder actuators on different valves. I am stuck at the very end where I should calculate the air consumption rate. All calcs are in metric units. Okay as an example let's use the following: Valve: SKG200 with...

Let a particle of mass m be rotating in a circle, radius be r, axis of rotation through the center and perpendicular to the plane of motion. Now if the radius is made decrease somehow at some rate until it get's zero, how do I find the rate of change in angular velocity? Also, the angular...

Homework Statement Let T = f(x, y, z), where dx/dt = 4, dy/dt = 4 and dz/dt = -3 Calculate dT/dt if dT/dx = 4, dT/dy = 7 and dT/dz = 9 Homework Equations dT/dt = ∂T/∂x (dx/dt) + ∂T/∂y (dy/dt) + ∂T/∂z (dz/dt) The Attempt at a Solution I tried to get an explicit formula for T. I...

What are the accepted numbers for the decay rate and lifetime of Z-> mu+mu- and Z-> e+e- decays? also what is the unit for the decay rate? thank you!

Hi, Let's suppose an elementary reaction of the low-pressure mixture has the initial reaction rate of x (2A + B --> A2B). What would be the initial reaction rate of the high-pressure mixture? (Imagine a mass M is placed upon the beaker filled with the mixture, and a mass 3M is placed upon...

Homework Statement A turntable of radius "r" is spinning counterclockwise at an initial rate of ω. at t=0, its rotation rate begins to slow at a steady pace. the rotation finally stops at t=T. At what time is ωt^2 maximum. Express your answer in terms of T.

suppose i want to transfer digital signals over 100 meter wire, the loic is implemented using two level, a +5 volts for 1 and 0 volts for logic 0. I want to transfer the data with speed 1000 Mbps which is 10^9 bits per second. now i consider the worst case scenario that my data consist of...

Does the Universe have a "Frame Rate"? Surely, thinking about it, things can't just smoothly transpose from one location to another, there must be regular gaps, (far to quickly for us to notice) where it "jumps" from one point in space to another. I think this because it seems hard to imagine...

Hi, I'm designing a system that spray water into air. I'm wondering how I should go finding out the relationship between the flow rate and distance of travel of the water droplet in air. If I am spraying the water going the same direction as the wind, how much would the velocity of the...

Homework Statement A cubic polystyrene box contains a litre of water at 90°C. It is 10cm wide and has a wall thickness of of 5mm. Room temperature is 25°C and the conductivity of polystyrene is 0.033W/m°C. What is the rate of temperature drop of the water? Homework Equations P=...

Homework Statement Helium gas flows through a well-insulated nozzle at steady state. The temperature and the velocity at the inlet are 550°R and 150 ft/s, respectively. At the exit, the temperature is 400°R and the pressure is 40 lbf/in2. The area of the exit is 0.0085 ft2. Using the ideal gas...

Homework Statement The Function S(t) = 6t(t+1) describes the distance (in kilometers) that a car has traveled after a time t ( in hours), t E [0,6] Find the average velocity of the car from t= 2 to t= 2 + ∆t Homework Equations y'= f(x+h) - f(x) ------------ h...

I don't understand why integrals and derivatives work, and i don't understand why theyre so closely related. Let's take a function y= x^2 + 2x + 9 y' = 2x + 2 Why do the rules for taking derivatives work? Why does reducing the power of a term by 1 and adding that as a coefficient work...

How would I calculate thermal exchange rate of Air for different amounts of humidity? I'd like to create a graph to show how much radiant heat air would absorb, (at some temperature (10°C) changes depending on the humidity amount, 0 - 100%

Homework Statement Air expands through a turbine from 8 bar, 960 K to 1 bar, 450 K. The inlet velocity is small compared to the exit velocity of 90 m/s, The turbine operates at a steady state and develops a power output of 2500 kW. Heat transfer between the turbine and it's surroundings and...

Homework Statement Determine the Nyquist sampling rate and the Nyquist sampling interval for this signal. sinc(2100\pit) Homework Equations N/A The Attempt at a Solution Ok I know that the Nyquist sampling rate is double or 2 times the bandwidth of a bandlimited signal. So I...

It is commonly said (based on a quick Google search) that wrapping your beer in a wet paper towel and placing it in the freezer will allow it to cool faster than placing it in the freezer without said paper towel. Newton's Law of Cooling suggests otherwise. The fact that water releases energy...

Hello! I was reading a journal article on modeling the interaction between different neural networks and I am confused about the follwoing method (cited below). It is describing the spike rate output of a neuron based on oscillating firing rates of excitatory (E) and inhibitory (I) inputs...

We are using analog signaling to transmit our data. If we utilize 4 different phase shifts and 8 different amplitudes and the bit rate is 100 Kbits/s what is the baud rate of the channel? I was thinking that it is log_{2} (4 * 8)/100 =1/20 but i think it is wrong.

Hi, This might be a silly question but I've been struggling to find this out. What is the relationship between dose rate and the amount of Cs-137 in an area? if I know the exposure dose of the area is 5mSv, how can I work out how much Cs-137 is in this area? Thanks

Homework Statement Air enters aone-inlet, one-exit contreol volume at 6 bar, 500K and 30m/s through a flow area of 28cm3. At the exit the pressure is 3 bar, the temperature is 456.5 K and the velocity is 300 m/s. The air behaves as an ideal gas. For steady state operation determine a) the...

Hello, I have a box with a hole directly connected to a blower inside. I can use the air sent by the blower to give a thrust to the box, in order to move it. I can say the the box is in a room, so open air around the box. The thrust should be 35 N and I have to calculate the pressure and the...

Hey guys, first post. I'm trying to determine to the rate at which liquids drop out of a gas pipeline. I've modeled the system in a chemical process program, but its only a steady state model. Anyways, here's some of what I can get out of that program: Heat of vaporization Total Heat Transfer...

I have head loss (25.95ft) and converted that to pressure (17.19psi). I am trying to find flow rate in 3" sch 80 pipe coming from railcar at 25psi. So outlet pressure is 7.813psi. The fluid is 50% Caustic soda.

Homework Statement A cubic container with sidelength l has a small hole with cross sectional area a (a<<l). The gas has density ρ and pressure P. Find the initial rate of gas leakage given that the outside pressure is 0. Homework Equations The question mentions the formula p=ρc2/3 so...

Homework Statement A particle moves along the x-axis in such a way that its distance x cm from the origin after t t seconds is given by the formula x= 7t + 12t2. What distance does it travel in the nth second? Isn't it 7(n) + 12(n)2?

Homework Statement A ball is thrown vertically upwards and its height after t s is s m where s= 25.2t - 4.9t2 Find the distance moved in the 3rd second 2. At the instant from which time is measured a particle is passing through O and traveling towards A along the straight line OA. It...

How does the mass of a pendulum bob affect the time taken for the oscillation of a pendulum to diminish? At first I instinctively thought that it would have no effect. However, thinking about the pendulum bob's momentum as it interacts with the air molecules, a higher massed pendulum should...

If dark matter is accelerating the expansion of the universe, then how fast did the universe start expanding at the point of the Big Bang ? The pre-Standard Candle model of the Big Bang held that the expansion rate had always been declining and by backward interpolation, must have been very...

An ore loader moves 1460 tons/h from a mine to the surface. Convert this rate to lb/s, using 1 ton = 2000 lb. Homework Equations No Idea, I've tried the converter but the results come out wrong.

If the APR is 3%, and I want to find the tri-monthly interest rate, is the correct way to find it: (0.03+1)^(4/12)-1 ?

So, In Lamarsh, when he talks about the burnup , he's talking about the fission energy released per unit mass of fuel where as when he talks about consumption rate, he's talking about the amount of fissile matter consumed per unit energy produced?

In the mark scheme they have done P = (8×1013) × 5.3 ×106(1.6 × 10-19) = 67.8 W I don't understand why they have done this? How does Activity x Energy= Power ?

I just posted a question to ask for help on the Calculus & Analysis section to determine how fast planets go into stars. I should give a little background, in addition to pointing you to my latest two short papers: http://arxiv.org/abs/1301.4229 and http://arxiv.org/abs/1211.1984 I have...

I was thinking about meteorioids and how upon their entry into the atmosphere the large amount of disintegration they experience so i wanted to try running through a calculation of something similar to see if i could i understand it better. I'm going to outline a general thought process I've...

Homework Statement "On a certain clock, the minute hand is 8 cm long and the hour hand is 6 cm long. How fast, in cm/min, is the distance between the tips of the hands changing at 9 am?" Homework Equations The Attempt at a Solution I should be able to transform this somewhat...

Hi, yesterday my dad and I were debating whether flow rate stays constant throughout a system. I told him we learned this in physics and he refused to believe it. He's a plumber so he may have thought his reasoning was more justified than mine. He finally said, "I can disprove it now" and...

I need to figure out the best way to improve drainage of spring water flowing through my property. The water from my neighbour’s spring flows 10m through a pipe into a manhole on my side. The water level in this manhole is always 10-20 cm higher than the in and out pipes. The water then flows...

[b]1. If you took out a $11,250 car loan at 3.840 % for 5 yrs (60 months), (a) what would be the monthly payment? (b) what is the difference between paying the $11,250 up front versus taking a loan out for it? [b]2. Interest formula: I= P r T [b]3. (a) I= (11,250)(.03840)(5)...

I am majorly stuck, we are doing a report in which we determine the flow rate using a venturi then compare values with the flow rate from a pitot tube. So basically we have recorded pressure values with a pitot tube, moving the tube 2mm from the centre of the venturi each time and re-recording...

I'm only in a high school class. I just made up this problem to see if I'm getting the right idea in the long run. That, and then there's the fact that differential equations are SO MUCH FUN! :biggrin: Homework Statement Molecular bromine (initial concentration: 0.49 M) and formic acid (initial...

Convection heat transfer rate decided by Newton's cooling law doesn't have a relative velocity between the fluid and the solid surface term. But intuitively doesn't blowing faster on a hot surface make it cool quicker?

Homework Statement I had an assignment where I needed to calculate reaction rate constants at different temperatures. I was supposed to use ab initio method (meaning I should use Spartan software), molecular partition functions and Eyring equation. The reaction was: H+HD...

Homework Statement Ship A is 100 km west of ship B. Ship A is moving at 35 km/h (west), ship B is moving at 25 km/h (north). Find the rate of change of the distance between the two ships after 4 hours. Homework Equations The Attempt at a Solution the distance between the two ships is shown by...

Homework Statement A coil has self inductance L of 2 Henrys, and a resistance R of 100 Ohms. A DC supply voltage E of 100 volts is applied to the coil. Show graphically the approximate rate at which the current increases at the moment of switching on (t=0) and after 10ms. Confirm your...

Homework Statement A hot reservoir is maintained at a temperature of 78 oC, and a cold reservoir is maintained at a temperature of 5oC. They are separated by 11.00 cm, and are connected by a cylindrical bar made of two materials. The radius of the bar is 0.83 cm. The upper part of the bar is...