increase Definition and 843 Threads

In a problem in our book, it says that the mach number in a constant area duct with friction (Fanno flow), the mach number increases from 1.8 to 1.22...however, from the Fanno line, its very clear that in the supersonic region, mach number always decreases along the flow...is there some kind of...

Homework Statement If a big star gives of wind , forming shock and then a bubble .. And then this bubble is driven by pressure Also as the bubble expands the surrounding mass gets added to it Does it make sense for the Total energy to increase ? Homework Equations The Attempt at a Solution

Hello, This is my first post, I signed up especially to ask it. I recently finished reading Steven Hawking + Leonard Mlodinow's "The Grand Design" and I found it really interesting. The bits I found most interesting were the parts on quantum physics, more specifically wheeler's delayed...

Hello, The speed of wind generator and its voltage are constant. The power needs to be constant, so does the magnets. The clue is to increase the current generated, how it can be done without altering the voltage, geometry or the speed? Thanks in advance!

hi guys new to this forum as of today . I am currently buliding my self a little project but before i go out and blow money on parts i was wondering is there anyone out there that knows if this will work I've attached a diagram of what i want to do sounds simply enof but will i gain power...

The inductor is initially an air cored one.When the Iron core is introduced,the resistance is found to increase considerably.Please explain.

I could rephrase the same question, why does the frequency decrease when load exceeds generation? I know these are fundamental operating characteristics of a power system network but I'm not sure I can mathematically prove it. My best guess is that everything dissipates more power when the...

I mean, If an ideal step up transformer increases the voltage from 10V to 20V say, why does the current halve? I know it happens and I know the equations for it, I know to say otherwise would contradict the law that energy cannot be created. But putting the equations aside, why exactly...

Homework Statement We blew up a balloon, attached a data logger inside the balloon. We then popped it and checked if the temperature increased or decreased. Most of the time, the temperature increased (from around 29 degrees Celsius to 29.2 degrees Celsius). Why is this so? Homework...

If i have a shaft & I'm applying a driving torque D at one end & at other end there is resisting torque R due to bearing friction, etc. Then if D>R, i have net torque = moment of inertia times angular acceleration. Since the ang. accln is constant with respect to time, will the ang. speed of...

I'm currently playing with diamagnetic pyrolytic graphite and I have created a small portion of a track similar to this video I want to create a circular track for it travel on, but as rare Earth magnets are getting expensive I'm going to use thinner magnets that consequently have a weaker...

Homework Statement A 1.2 g pebble is lodged in the tread of a 0.76-m automobile tire, held in place by static friction that can be at most 3.6 N. The car starts from rest and gradually accelerates on a straight road. How fast is the car moving when the pebble flies out of the tire tread...

I am looking at inflation at the moment, and it says in my textbook that (aH)^(-1) is constantly increasing in matter or radiation dominated epochs. a is always positive and always increasing. This tells me that da/dt is positive. I think that setting the universe to MD/RD means that da/dt...

Like photons, all particles have a wave/particle duality, so when energy is added to an electron, say in a particle accelerator, why does the "amplitude" of the electron wave never increase (say as an increase in the actual number of electrons) - why is it that the energy added always just comes...

I remember reading an article on exoplanets which suggested that when a star loses its mass, the orbital radii of the planets orbiting it increase. Apparently this makes it easier to identify such planets as they are now further away from their star. What I would like to know is, what...

Hello, I am a firearms enthusiast. In my collection is a Gewehr 88/05. This was Germany's first smokeless issue rifle and it originally used a smaller bore than is used today in the 8mm. It was converted in 1905 to take a 0.323" bullet instead of a 0.318" bullet. The leade (free...

Homework Statement If positive work is done on a positive test charge will the work increase,decrease or stay the same if the test charge increase Homework Equations W=fa W=∆K The Attempt at a Solution the magnitude of the test charge doesn't affect the Electric Field so the work...

I was reading that i certain type of linear accelerator increases in output though time... why would this be? If anything i would have thought it would have been the opposite.. thanks

【HELP】Equation of temperature increase by shock wave Hi there! What is the equation of the temperature increase when the ideal gas swept by a planar shock wave (Mach number, M)? Thank you!

as we move forth in time, does the universe become more or less complex? is this related to the theory of thermodynamics? I just need a brief explanation I'm a bit confused. Thanks!

It was only in 2004 with the launch of Gravity Probe B that spacetime curvature was physically ascertained to exist, previous to that, it was a simply an extremely elegant proposition underlying GR. Similarly, has the increase of mass with relative velocity been physically proven to exist or...

Hello all, i doubt this but is there anyway now or in the future to increase ion wind to where it acts like and has the same strength as regular wind?

Homework Statement f(x)=x — cosx, 0 ≤ x ≤ 2∏ Homework Equations The Attempt at a Solution I took the derivative of the function: f'(x)=1+ sinx, 0 ≤ x ≤ 2∏ I don't know how to determine whether it is increasing or decreasing between the interval given. What should I do?

i'm given a circuit that contains a 15 volt battery and a resistor that has a power rating of 1/4 watt and a resistance that must be greater than 1 kohm. I'm told that no matter how i set it up, i cannot exceed the 1/4 watt power rating of the resistor. this makes sense. i work out the max power...

Increase in weight if an object is illuminated Are there experiments which show that the weight of a body, with initial mass between 1 g and 1 kg, really increases if illuminated for a certain time? Photons have energy E = hf but no mass. If the weight of a body gets bigger after being...

Hey Guys, I was doing physics questions. It was written that in the absence of friction, the acceleration of any object sliding down an inclined plane is given by:a=gsinθ. As the skier skis down the curved hill, the angle of inclination is increasing, so the acceleration of the skier is...

Revered members, Conductors have positive temperature coefficient of resistance, that is , their resistance increases with temperature. While for insulators and semi conductors, the resistance decreases with increase in temperature, what we call negative temperature coefficient of resistance...

Hi, I'm using the finite difference method to solve both the Reynolds Equation and the Poisson equation in order to calculate the air pressure of a porous air bearing. The Reynolds equation describes the flow in the channel between the rotor and stator, while the Poisson equation the flow...

If mass really increases with speed then if 2 rockets leave earth, traveling parallel and close together, at close to the speed of light, then from an Earth point of view, as their mass increases, so should their gravity and they should be drawn together. But from the spaceship point of view...

dear guys, first of all.., I'm sorry because i not sure my question suitable in this forum or not. if not, mr moderator please move my topics to correct section :redface: my problem is, how to increase the pressure of the r22 gas in the tank diameter 10 inch x 30 inc (length). my tank can...

What can I do to increase my chances of getting accepted? I'm currently a freshmen at Wichita State University studying Electrical Engineering. My hopes down the road are to get a PhD in Robotics at Carnegie Mellon University. As it stands currently, I'm pretty unimpressive on paper. My GPA is...

I (think I) understand that: 1. With the Schwarzschild metric, the ratio of proper time to coordinate time decreases ("clock runs slower") with decreasing radial distance. (And ratio of proper distance to coordinate distance increases.) 2. The geodesic path followed by a freely falling...

I have a dc motor geared to a diaphragm pump, and all hardware are unchanged. As i increase the supplied voltage, rpm increases, but so does the current (torque). I thought rpm increase would lead to higher back emf, and thus lowers the current. So would the only reason for my increased...

Homework Statement If in Joule's paddle wheel experiment a block of mass 10 kg is allowed to fall through 22.5 meters and the mass of the water is 50 grams. What is the total increase in temperature of the water? Can your value of J be used for determining how much mechanical energy can...

As I understand it, if you are moving fast enough relative to me, your mass increase will cause you to APPEAR like a black hole to me, even though you will not see yourself as a black hole. It would be an illusion, right? And also you would see me as a black hole while I would reject that view...

I am working on a simple motor and I would love input or tips to increase the rpm on it. The motor is built by having a 1.5 v D battery connected to 2 bobby pins for and a coil of wire that one side is fully stripped and the other side is on the other side is only stripped on the bottom. Then...

Homework Statement What is the direction and rate of maximum increase? f(x,y) = x^2 + y^3, v = <4,3>, P = (1,2) Homework Equations The Attempt at a Solution The direction should be as same as the gradient so < 2,12> The rate of maximum increase is magnitude of the gradient so...

Hello, I was wondering if particles that have a set position such as for example particles within the Earth's core would experience a temperature gain due to gravity. If kinetic energy is applied to the particles in the air due to gravity, then kinetic energy should also be applied to...

is there a physical explanation of mass increase ouside relativity? I understand it is KE, can it be explained with a progressive increase of "internal" resistance? I mean: if a body free-falls in the atmosphere external resistance increases with velocity, until it reaches terminal velocity...

Hello, I wondered if anyone could provide a bit of guidance. I have a Helium cannister at 500bar pressure with a flow restrictor supplying Helium at 8 bar pressure to a room of 24m^3 at 1 bar pressure. The Helium flows down a 50m pipe. I want to calculate the pressure increase in the room...

Homework Statement This is a problem form my calculus book, which states: According to the ideal gas law, the pressure, temperature, and volume of a confined gas are related by P=kT/V, where K is a constant. Use differentials to approximate the percentage change in pressure if the temperature...

Homework Statement A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. (a) What type(s) of energy is (are) changing? Is each type increasing or decreasing? Why? Homework Equations...

Hello I need help with these problems. The direction said a. find the intervals on which f is increasing, b. the intervals on which f is decreasing, c. the open intervals on which f is concave up, d. the open intervals on which f is concave down and e. the x-cordincates of all inflection...

Hello. So: Why does magnetic force tend to increase magnetic energy? 1) Usually, forces go in the direction of energy minimums. Why in this case is the opposite? 2) What does it imply? What is that makes magnetism particular in some senses, for example this, for example its force function...

Homework Statement In Fig. 6-12, if the box is stationary and the angle θ between the horizontal and force is increased somewhat, do the following quantities increase, decrease, or remain the same? http://i.imgur.com/YcOFS.jpg a) Fx b) fs c) FN d) fs, max e) If, instead, the box...

Does it mean that as you increase the energy of a particle, its mass will increase? Or, that for any given particle there is a certain container of certain mass/energy and part of that quantity is allocated to energy and the other to mass. In the latter case, could you not make a transistor out...

Hi to all, I'm in this problem: I've got to prepare a solution of Ca(OH)2 with pH=13.2 . On Perry I read that the solubility value of Ca(OH)2 at T=25°C is 1.65 g/L, so a solution with water and Calcium Hydroxide cannot reach pH=13.2. So I was suggested to prepare the mixture in the following...

if a rocketship in space is approaching the speed of light and its relative mass is increasing then i assume the fuel mass is increasing which would make it more potent the closer the ship gets to the speed of light which would give it infinite force when the ship reaches the speed of light...

diamonds shine brightly because light inside them is reflected repeatedly within its walls.why this repeated reflection increase the brightness of light??

Can someone explain this excerpt from my textbook please? "IF nucleus A was made from its constituents (Binding energy) and it released 400MeV, but making nucleus B(product) releases 405MeV. Therefore if A changes to B, 5 MeV of energy must be released. This excess energy is given to the...