Type Definition and 912 Threads

I'm taking mechanical engineering thermodynamics right now and it's awesome. We just got into enthalpy and stuff like that and it's so interesting. It has me thinking that maybe I want to do something that has a lot of thermo or subjects that are similar.

Homework Statement Show that sin 600° . cos 330° + cos 120° . sin 150° = - 1 Homework Equations I know that sinΘ = opposite/hypotenuse and cosΘ = adjacent/hypotenuse. The Attempt at a Solution I am equipped with knowledge about what sinΘ and cosΘ is from right angled triangle. I stand in...

I'm trying to decide which sort of engineering I want to do. I am leaning towards mechanical, what are examples of environments where mechanical engineers can work? Thanks.

Hi, I made a program to send a message from a Server to a client on the same machine in NetBeans on a Button click. I used the following code in the button handler:private void sendMsgButtonActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: try{...

I would like to get a handle on human Wattage under various conditions. it would be great to compare theory calculations of say running up stairs with how much ACTUAL wattage it takes...just for physics fun. the only common bench top measurement device I can think of is those wrist-watch type...

I'm back in school after decades away and taking alternative energy .. just because it was interesting. In the wind power class we talked about Hugh Piggot and the home brew HAWTs he makes and teaches. That gave me the bug to see if I can do it. I'm pretty sure I can buy a used turbine on EBay...

Sorry if this aint undergrad its hard to tell what is and what isnt. I wanted to know if these two things linked or are they completely different? I am looking at the causes of the narrows bridge collapse... it would seem that the flutter has to do with vibrations but not exactly with resonance...

Hi everyone, I've been working on developing a crypto-currency called eQualityCoin for a while now and hoped someone here might be able to help me "classify" the system in a formal mathematical sense. The system's main feature is a simple rule for how it determines a purchaser's exchange...

Hi, I am using a book for studying UML. It shows attributes without any data types: dataReceived isPrepaid number: String price: Money What is the data type associated with above two i.e dataReceived & isPrepaid & what is their visibility (i.e publc /private). Some body please guide me. Zulfi.

When a supercooled type two superconductor is subjected to a static magnetic field, the superconductor pins to the flux of the field (the mixed-state meissner effect is apparent). What happens if it is subjected to a continuously changing magnetic field, assuming the superconductivity takes...

Homework Statement Given a matrix n x m with unsigned char data type entries (entries are of size 1 byte, so data type of an entry should be unsigned or signed char, not int or char *). Entries are read in hexadecimal format (0x00,0x11,0xFF,...). Matrix should be allocated dynamically. Print...

Hi, Does an Atom's Type have to do with the number of protons and neutrons it has? Or are they completely unrelated? Just curious. Thanks :)

Hello, everyone I am new to the site I was wondering if the Universe and gravity are types of fluid? As you can read I am not a cosmologist or even a physicist but I love science

I've got a rather simple inquiry, but I haven't been able to get a straight answer via Google searches. When evaluating the impedance of an inductor, do eddy currents represent a series resistance through, or a parallel resistance around the ideal inductor? I've read that eddy currents are...

Does a type I superconductor has to be single crystal? If not, is there any change in its Tc when it becomes polycrystal? Thanks.

my attempt yteast

Homework Statement Find the integral \int \frac{3x+1}{(x^2-x-6)\sqrt{3x^2+4x-7}}\mathrm dx 2. The attempt at a solution I have tried the types of substitutions of irrational functions, and Euler substitutions. However, it seems that nothing simplifies this integral. What substitution is...

the vw type 1 engine comes with flaps that close when the engine is cold. i know the flow through the fan doesn't completely stop but for the sake off argument let's assume that is does. the fan is spinning but there is no flow. what power is required to maintain the pressure differential...

Hi, I need to know the official name of these type of fraction problems? This is what I wrote on a flash card I couldn't upload the flashcard because of file size. Example problem - 4/3 times x = 6/7 These are the instructions I wrote on the flash card. 1. Divide sides by left (least)...

Homework Statement e) If H ∼= Z3 × Z3 show that there are exactly 2 conjugacy classes of elements of order 2 in Aut(Z3 × Z3) = GL(2, Z3). f) Choosing an element of each conjugacy class in e), construct two semidirect products of H and K. By counting orders of elements in each such group, show...

Homework Statement Below is the bode plot of return difference, 1+C(S)P(S) in a feedback system. Identify the frequencies where the feedback is large, negative, positive and negligible. P(S) = \frac{100}{s^2+2s+1} C(S) = \frac{220(s+50)}{s+200} Homework Equations Bode Plot, Feedback The...

It is no doubt that these type of problems are very different to problems one would find in a maths textbook. I find them extremely challenging even after done a Master degree in mathematics. However, the solutions make a lot of sense after reading them. I am coaching a high school student in...

Hi everyone. I'm a high school student. Recently I have been doing some past papers to prepare for the public exam in April. The reaction "ethene + steam ----> ethanol" is given and I was asked to name the type of reaction. I answered oxidation but the answer is addition. Later I asked my...

It is easy to show that when you have a quantum system, let's think for example in electrons in a metal, then there appears summation over electron states of the form, e.g. for the energy for a free electron gas at T=0K: ##E=2 \sum_{k\leq k_f} \frac{\hbar^2}{2m}k^2## Where ##k_f## denotes the...

Could use some help figuring out the error Operand type clash: numeric is incompatible with uniqueidentifier which points to the specified line below CREATE PROCEDURE AddPartner @name NVARCHAR(50), @email NVARCHAR(254), @new_guid UNIQUEIDENTIFIER OUTPUT AS BEGIN SET NOCOUNT ON...

Homework Statement In class we were asked to build a bridge with the length of 50 cm and the width of 20 cm, maximum weight is 50 g and the test is to place the bridge on two parallel chairs and then place a heavy object in the center. we can build any type of bridge. material: unknown. My...

Let G be a subgroup of Sym(X) and ρ ∈ G. Prove that Gρ(x) = ρGxρ−1, where ρGxρ−1 = {ρgρ−1|g ∈ Gx} What I Know: I need to somehow prove the left is contained in the right and the right is contained in the left. What I Have Done: Well based on the definition of a stabilizer Gx I assumed that...

I was going to make a modem uninteruptable power supply, and I was thinking (possibly over complicated) that I could have a relay with the solenoid that has a potential over the battery bank and the power supply, so there would be near zero volts potential when the power supply was on (and...

I read that state preparation is simply measuring and confirming the system. Filtering type observation is when the observation doesn't destroy the system. But googling doesn't produce the extra words "Filtering type observation".. why is these words only in physicsforums.. what are the other...

Hello all, I am not very sure with this kind of weld check, could you give me some help and suggestion? Details as following: Given: Ft=force in y direction Lt=distance between Ft action point and weld group geometric center(y direction) Fl=force in x direction Ll=distance between Fl action...

So there was this question: Which sample demonstrates particles arranged in a regular geometric pattern? A. CO2(g) B. CO2(s) C. CO2(l) D. CO2(aq) E. None of the above I chose E because I thought that covalent molecules, when solid, would be arranged in a random pattern, especially since this...

Hello everyone, I am looking for one special type of nut (see image) for weeks without success. It is used to connect threaded part and syringe needle. This thing is driving me nuts. Is there any place to get similar ones or what is the exact name of nut in this shape? Thanks!

I was just wondering what type of calculus is in cal based physics 1? I'm a little rusty at calculus, so I was just curious...

messed up original post: "Hunter is having a top cover re‑designed" no period. now click the cursor right before the d in designed. hit tab, it will tab a single space. not a full tab. change "Hunter" to "Mike" or any other name, it will do a full Tab. try a word like "re-test" or...

I have an array of n strings (with blank spaces). Data type of an array is char***. How to allocate memory for char*** data type?

Homework Statement A 500-N person stands 2.5 m from a wall against which a horizontal beam is attached. The beam is 6 m long and weighs 200 N (see diagram below). A cable attached to the free end of the beam makes an angle of 45 degrees to the horizontal and is attached to the wall. a) draw a...

A particle with mass m and electric charge e is confined to move in one dimension along the x -axis. It experiences the following potential: x<0 V(x) = infinity, x>=0 V(x) = e^2/4*pi*ε0*x

There are several Bell inequalities involving 4 values (e.g. CHSH where they are sometimes denoted by Q, R, S, T). The original Bell inequality involved 6. All being refuted by QM. Is it known whether there is one with only 3 values? I can prove there isn't one with 2 values.

What's the type of wave functions? Is it just: function from a point in spacetime to Z; takes a location and returns an amplitude in discrete units? (bonus question: according to your favorite theory, what is the type of points in spacetime (that is, topology of spacetime)? is it like r^n for...

Homework Statement From extensive records it is known that the duration of treating a disease by a standard therapy has a mean of 15 days. It is claimed that a new therapy can reduce the treatment time. To test this claim, the new therapy is to be tried on 70 patients and their times to recovery...

Hey, I recently received a message from one of my friends. He's a real joker, thinks it's funny to send my pieces of code. This one had me stumped; from the little, and I mean very little, I know about code, this looks like base64 does it not? H05LekhYaNE3Y7Movd47Y0KYHnuX/srs/V0pEk22bl8= But I...

Hi, I am trying to get some information about why Matt black surfaces are such good emitters and shiny surfaces are not. When you try and look this up there really isn't much so I have tried to string what I have found together. Shiny metal surfaces have free electrons which cancel the...

Homework Statement Find the area of the region between the graphs of: y=x^3+3x^2+5x and y = x^3+2x^2+7x on the interval [-1,2] The Attempt at a Solution I am not entirely sure what they mean by the REGION between the graphs, is this the region which encloses an area when the two functions...

So I'm trying to figure out how to calculate the force behind the pressures achieved in this press. I know the pressures achieved with specific amounts of water(weight) for the pivot point being at either pin a or b but I'd like to know how to calculate this myself. I've tried looking up...

< Mentor Note -- thread moved to HH from the technical forums, so no HH Template is shown >[/color] experiment for testing type of catalyst on reaction rate? I need an experiment (just the method) Where I can test the reaction rate of changing the catalyst type I need about 3 differnet...

Homework Statement A spaceship with mass m = 800 kg moves freely in gravitionalfree zone. It moves with a constant velocity v = 1.5 km/s for t < 0. At t = 0 the spaceship is starting to break using a rocket acting on it with a time dependent force F(t) = Bt (T-t), where B is a positive...

$$\int dz \frac{\sqrt{\frac{1}{4} (x+1)^2 (z-1)^2-x} \log (z)}{z}$$ All values are real. The domain for z and x are both [0,1], with also the constraint that the Sqrt is real ( which means z is really from ##[0, 1-\frac{2 \sqrt{x}}{x+1}]##. I'm just trying to get the anti-derivative, and not...

I am designing a custom socket for an application at work and I am concerned about the wall thickness in the area marked by the red box (see attached drawing). The socket will be used to torque a nut to 500Nm. I have a degree in mechanical engineering and I can do stress calcs on straight...

hello. My FYP is to observe the behavior of a valveless pulse jet by changing shape and dimensions of combustion chamber( i am keeping the volume of combustion chamber constant). i need to know what type of sensor should i use for temperature and pressure measurement. I mean temperature should...

If charge -Q of mass m is kept on y-axis at large distance from the center,then it will execute oscillatory and periodic motion but if it is released very close to the origin then it will execute SHM .I want to know why?I mean how the distance from centre decides type of motion oscillatory or SHM?