Rate Definition and 1000 Threads

I have several questions related to gravity. I first need to know if gravity decreases at a steady rate for very 1 mile higher up we go?

First, I'm not sure if this is the right forum to post this question. It's not a homework problem or any assignment. Just doing this as an exercise. Ill just post it here just in case. I’m trying to write a c++ program to calculate the monthly interest rate 'i' given the loan amount 'P' ...

Assuming the AUV only relies on a ballast system to ascend and descend, and that the ballast is completely empty of water at the surface and completely full of water at the seafloor, will they ascend and descend at the same rate? Assume the AUV is neutrally buoyant at the surface for...

I was reading this (which is notable for its non-science content, but I am only referring to this part): https://www.nationalreview.com/2020/11/wokeists-assault-space-exploration Is there a matrix that shows the amount that goes between the planets? (And here, I consider a moon to be a "planet".)

Frankly, i don't even know how to start this. I deducted from the solution, that they must have used power/(specific heat capacity x temperautre), however i don't understand how that will give the rate of flow of air. Could anybody help, please?

What is the difference between peak dose 100 kRads (Si) and peak dose rate 10 x 10^12 Rads (Si)/s? Can someone explain?

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...

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...

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...

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

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

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...

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.

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

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

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: $$ v= e^{ \frac {-tk} m } * (u + \frac {gm} k) - \frac {gm} k $$...

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...

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

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.

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...

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...

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...

Summary:: Having the following dates:

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.

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...

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...

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...

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...

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...

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...

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...

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!

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...

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...

No idea how to solve

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...

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...

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?

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...

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 =...

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!

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?

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

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...

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...

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?

my question is in fig.

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