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Was wondering whether a 2 kilometre section of 80mm asbestos water main was replaced with 150mm PVC then rejoined into the last 3 kilometres of old asbestos would it create pressure breaks. The head pressure is 50 metres. Cheers.

Homework Statement What would be the effect on the following if the load torque is increased and the speed maintains constant: a) the tension in the tight side of the belt b) the tension in the slack side of the belt c) the power transmitted Homework EquationsThe Attempt at a Solution I...

Do systems further away from equilibrium increase entropy faster than a system with a high level of entropy and does this increase push the universe towards thermal equilibrium faster. Is there anything stopping the universe from reaching thermal equilibrium?

Hi guys, This question has me a bit stumped and I can't seem to find any methods on Google that would help me solve this: The last part of the question asks me to find the value of the scale factor, which in this equation I believe is 1.8. I know how to calculate percentage increases the...

I was hoping to get a more complete understanding how a Venturi vacuum increases the Momentum of the fluid. I know Momentum is an awful way to pose this question but it really is important that it can be explained by momentum instead of conservation - Hence the post. An initial pressure...

Hi all Why the entropy increase across the stock wave.? How we can explain it Thanks

Homework Statement In an empty rubber raft the pressure is approximately constant. You push on a large air pump that pushes 1.0L (1.0×10^−3 m^3) of air into the raft. You exert a 16N force while pushing the pump handle 2.0×10^−2 m . Part A: Determine the work done on the gas. Part B: If all...

I just did a thermoelectric generator from seebeck plate. And when temperature increases, the plate's resistance increases from 12 ohms to 8 M ohms. Why is that and how todeal with it??

Let's say we have two samples of pure Helium-4, and two other samples of pure hydrogen fluoride (consisting of Hydrogen-1 and Fluorine-19) all in separate containers. One container of each chemical is at the same initial temperature of 200°C at a pressure of 101kPa, and the other ones are at...

I'm using the DN007 antenna: http://www.ti.com/lit/an/swra351a/swra351a.pdf and I've managed to get the same loss/response in CST as what they have in their data sheet, however I'm wondering how I can increase the BW? It passes through ~2.4GHz, but I'd like to increase that to include about...

I'm talking about the chemical shift. In XPS test, oxidation leads to the increase of binding energy. This is determined by: 1. attraction between nuclear and the electron 2. shielding effect from outer-shell electrons My question is : What does shielding effect mean? Shield what? The positive...

Homework Statement Find the intervals of increase/decrease. Use first derivative test to find the local maxima and minima. Sketch a rough graph. Homework Equations a) f(x) = 2x2+12x-1 b) f(x) = 1/2x4-2x2 c) f(x) = 3x-4 sqrt 2 d) f(x) = x2-1/x2+1 The Attempt at a Solution A) it becomes f...

I understand that from KVL e = v -IaRa e=k(flux)speed speed=(constant)*(V-IaRa)/flux But physically what causes the speed to increase? What force causes the rotor to accelerate? In fact physically, the rotor is moving because of field flux interacting with armature current's flux. So...

In class we had a conceptual problem: There will be a race between two springs. Both will receive the same initial impulse, but one has been agitated and is therefore oscillating in some way, the other is just still. Who arrives first? The answer is that the still spring arrives first because...

So I have a 28BYJ48 stepper motor... it is rated at a voltage of 5V. I would like to optimise its speed and torque, which could be done through increasing voltage, but I know that an increase in voltage means more current i.e. will get a little hot. My question is... if I do run it at a high...

Why does dark energy increase along with the expansion of the universe ( I'm not even sure it does but if it dosen't please correct me :))

Hi everyone. Could anyone help me solve this. I need to find the increase and decrease intervals of f(x) = sin(-3x). The increase intervals of sin(x) are -\pi/2 + 2\pi*k < x < \pi/2 + 2\pi*k Is the following the right way to solve my problem (for increase intervals)? -\pi/2 + 2\pi*k < -3x <...

Homework Statement Explain why the number of modes per particle increases with increasing temperature for all gases (except monatomic gases). Homework EquationsThe Attempt at a Solution I am trying to use an energy argument but to be honest, I don't understand the excited state vs rest state...

1. A 50kg alumium block is dropped from a large height and hits a container of water at 150m/s. Assuming all the kinetic energy of the falling block goes into heating the 5kg water, what is the temperature increase of the water. Homework Equations Q=mc(change of t) KE=.5m(v^) maybe?[/B]The...

Hello, I was just thinking about the pungent smell of alcohols and if they increase as the molar mass of the alcohol increases. For example, if I were to have samples of methanol, ethanol, propan-1-ol, butan-1-ol, and pentan-1-ol all at room temperature, would the alcohol's with the highest...

From the following diagram: When a wire is placed in a magnetic field ##B##, and current starts to flow within that wire. It creates it's own magnetic field(##B_w##). Will ##B_w## interact with the external field ##B##? If it does, is the result of the interaction the Lorentz force? Also...

Can pull up exercise (at a younger age, say, before 15 years old) increase height? My guess is yes, since weight lifting could decrease height (Or that is another myth?) If yes, by how much?

If I crumple and unfold a piece of foil, am I increasing it's surface area? Since it's malleable, if I step on it with golf spikes, without completely piercing it, will it gain surface area?

Hi there, I was wondering if you could help me, I think I may have some concepts wrong or incomplete. Homework Statement We have an adiabatic cylinder of volume ##V_1## filled with a gas of pressure ##p_1## and temperature ##T_1## in thermal equilibrium, closed with a piston. All of a suden...

Hi, I am building a simple pulley for a weightlifting machine. In most cases pulleys are designed to lift heavier loads easier, I want to actually make it harder to lift the load… So I don't have to put so much weight on the end. Can I amend my simple pulley design in a (simple) way to...

(constants're ommitted) 1-) M=50, m=5, h=5 then Potential Energy = (50*5)/5 = 50 After increasing height 2-) M=50, m=5, h=10 then Potential Energy = (50*5)/10 = 25 Field strength decreases amount of h^2 so according to formulas potential energy decreases as h increases. But that mustn't be...

Homework Statement A missile is launched from the ground making 45 degree with the horizontal to hit a target at a horizontal distance of 300 km. If it is required to hit a target at a horizontal distance of 675 km launched at same angle with horizontal, find the percentage change in its...

This is just a question I posed to myself while learning about waves, I was wondering how the volume of an audible noise is increased or decreased, is it related to the compression of the wave and therefore the force generating it? If somebody could explain this in mathematical terms or provide...

This is probably a very noob question, but I can't seem to get my head around it. Why does an increase in velocity of a particle in a magnetic field, increase the force acted upon it, according to F_m = QvB? For example in orbital dynamics, an increased velocity of a body simply breaks the...

For example, I weigh a pebble and get a value of 7.1g. Then I measure again and get 7.6g, then again and get 6.9g.. Then I repeat the measurement using the same scale 5000 times. (its just a thought experiment). Is the mean of all measurements closer to the true value and if so, why? thanks

How to increase or decrease the frequency of AC current linearly? Suggest me some ideas

Is there such thing as a turbine that increases air speed/compression? This seems like a dumb question but I'm having a heck of a time locating any information on it because any iteration of "air turbine" entered into Google just brings up information about wind mills. I'm looking for something...

Stephen hawking came to know of a study that stated that surface area of an event horizon increases. So he said that since area has increased Entropy also had increased. But why does surface area of an Event Horizon increase?

Homework Statement In a test, I was told to identify 3 characteristics that could increase the velocity of the sound traveling through a cup and wire phone. This was a sound and waves unit test. Homework Equations -- The Attempt at a Solution I wrote that the linear density could be...

Why does the nucleus' attraction to the outermost electron increase across a period? I have been told that this is because each time you go across a period one step to the right, you add one proton and so there is more positive charge, but isn't it true that you also add one electron ? and so...

Homework Statement So right now I'm getting lost with series and parallel batteries. Current is the change in charge over the change in time. Higher voltages increases the rate at which electrons leave the valence band and move into the conduction band. Wouldn't increasing the voltage also...

Homework Statement A trapeze artist performs an aerial maneuver. While in a tucked position, as shown in Figure A, she rotates about her center of mass at a rate of 6.03 rad/s. Her moment of inertia about this axis is 16.1 kg·m2. A short time later the aerialist is in the straight position, as...

We have a situation. Someone modified the exhaust pipe from a diesel fired equipment. Exhaust gas flows out through a 30mm internal dia pipe. The modification carried out was to reduce the diameter of the pipe to 20 mm internal dia. The Exhaust outlet temperature from the equipment was 400 deg...

From a quick search of the forum is appears that an increase in velocity does not result in an increase in mass. If this is correct why can't objects be accelerated to light speed and beyond? If every action causes an equal and opposite reaction, what force stops an object from reaching light...

Hi everyone! I have an invention that I filed for a patent through PCT (WIPO) and about to enter national phase. The main idea of the invention is to "Simultaneously increase torque and speed in a gear train. As far as I know, torque and speed are inversely proportional to one another (in a...

the barrel has a lid at the top...sealed. I make a hole at the bottom to attach water hose to it. Then I turn on the water hose. The water volume in the barrel increases, no doubt about that. When It takes 7/8 of the barrel. Will the air in the top 1/8 of the barrel be compressed? I ask because...

I believe I understand that you cannot directly connect watts to lumens because although they could/may be related, they represent different quantities (I guess it's akin to comparing height and weight measurements for a person). However, given the same exact light bulb, typically the higher the...

I am working on my graduation design project, and I am responsible for making the power supply circuit. It is a lower power source, and acts like a current source that can supply current in the range of 30 mA to 130 mA. My power supply circuit has a source impedance of 85 ohm. Our load, a...

Homework Statement distance= z + b*time + x*(time^2) + y*(time^3) x=0,2m/s^2 y=0,15m/s^3 I have to calculate after how long time the speed has increased by 10 m/sThe Attempt at a Solution I have no idea what to do with m/s^3

Can someone please explain why the melting point of ice decreases with increase in pressure? I understand that generally speaking for a solid, greater the pressure applied, greater energy needed to break the bonds to change state and hence greater the temperature (melting point). What is the...

Hi all, i agree with you that those guys that use Oxyhydrogen to increase MPGs in their vehicles must be violating some physics laws but the aim of this post is to understand why. Lets call: Eq : Chemical Enegry Ee : Electrical Energy Emec : Mechanical Energy: Ecal : Calorific Energy I imagine...

I've been reading Kip Thorne's "Black Holes and Time Warps," and it mentioned something rather counter-intuitive; apparently, when material forms an accretion disk and falls into a spinning black hole, it increases the angular momentum of it. Now, let's take a gas cloud, and put a spinning...

Homework Statement Hello! I don't usually ask for help on homework, but I am really stuck and my physics teacher has no clue what she is doing. She doesn't really understand the material. Here is the question: There are two carotid arteries that feed blood to the brain, one on each side of the...

Homework Statement The number of 2 uF, 400 V capacitors is needed to obtain a capacitor value of 1.5 uF rated for 1600 V is..... Homework Equations The Attempt at a Solution equating the energy on both sides, 1/2*2*400^2*n=1/2*1.5*1600*1600, n=12, here n = number of capacitors...

Why isn't the dark matter just randomly distributed? How does it know where to go? Why does the amount of dark matter increase the further away from the galaxy's center?