Specific Definition and 1000 Threads

http://www.tpub.com/content/engine/14105/css/14105_20.htm This website tells me that Specific Gravity is weight of substance/weight of equal volume of water or density of substance/density of water. Can someone explain how this is true? Density and weight are two different things so...

Why the specific volume of a liquid decreases with the increase in pressure at saturation temperature and why the specific volumes of vapor at saturation temperature decreases with increasing pressure??

Hi, We're trying to build a simple antenna that's able to pick up a frequency of 457 KHz from a maximum distance of 20 metres. I'm totally new to this stuff, so I looked up the yagi antenna and some formulas used to determine the length of the antenna, but the results I got were huge...

Homework Statement My math is horrible and I'm in an orbital mechanics class which I'm way over my head...my question is... "What is the specific mechanical energy, e, of an orbit with a semimajor axis of 42,160km" Homework Equations I used a formula that took -3.986x10^5 / 2x...

I am wondering why the nation is gathering under the flag of bullying in relation specifically to gays instead of attacking the issue of bullying in general? I was bullied in middle school, and everyone just told me that was the way it was. I hate that bullying of anyone goes on and wish...

A constand current of 1A is flowing through the Helmholtz coils. When the voltage is altered the radius of the deflection beam changes accordingly. The trend line analysis of radius vs. voltage graphs give an equation of the form y=0.005x+25. (Hint: graph is plotted by considering r^2 (m^2) on...

We did an experiment using a calorimeter in class, where we dropped a hot piece of metal into water in the calorimeter. We measured initial temp of metal + water, and the final equilibrium temperature. This allowed us to calculated the specific heat of the unknown metal (we also had the mass...

Hi, I just did a specific heat capacity test using a calorimeter, and the specific heat capacity I found (using heat gained = heat lost) is less than the real value. The problem is, I expected it to be more. I mean heat will be lost through the calorimeter, meaning that a greater amount of...

Homework Statement how can I calculate specific heat at constant pressure from mass specific heat and mole mass?

Homework Statement Consider a particle-in-a-box problem, involving a particle of mass m subject to a potential: V(x) = +∞ for X≤0 V(x) = 0 for 0<X<L V(x) = +∞ for X≥L |ϕn> are the eigenstates of the Hamiltonian H with the corresponding eigenvalues: En = (n^2)*(hbar^2)*(Pi^2) / 2mL^2...

Homework Statement The cream is kept at 5 ºC in the lorries. It is pumped into silos, where it is pre-heated before being pasteurized. The silos are jacketed, and hot water is pumped through the jacket. Assuming no losses, if 300 kg of water at 90ºC enters the jacket and exits at 60 ºC...

Homework Statement 0.5kg of ice at 0 degrees celcius is mixed with 0.1kg of steam at 100 degrees celcius. what will be the final temperature? Homework Equations delta Q= m*c*delta T and at first i thought delta Q= m*Lf ,but then i changed my mind. . . The Attempt at a Solution...

For determination of the distance from a certain point, a function should be used. Namely, the input values 'x' are from N (1,2,3,4,5...), and the corresponding outputs 'y' from R, but such that the sequence 'y' (relative to 'x') is increasing; $y(1)<y(2)<y(3)<y(4)<...$ \\ but to satisfy \\...

The basic premises of what I am trying to do, is build a transmitter receiver circuit that has a signal strength identifier so I can calculate the distance between the transmitter and receiver. For example, if the chip is receiving 100% of signal strength (2mW) the distance equals 40 feet, and...

I have a query regarding Specific Volume, which is a property of a substance. I don't get why it is considered as an Intensive Property. It IS dependent on mass (SV = m/density) and hence I think it should be an Extensive Property. Could someone explain pl?

Homework Statement Let R have the topology consisting of all the sets A such that R\A is either countable or all of R. Is [0, 1] a compact subspace in this topology? The Attempt at a Solution If U covers R, if it consists of sets of type A such that R\A is finite, then [0, 1] is compact...

I need some help in calculating the specific volume ( in cubic metres per kg) of Nitrogen at various temperature + pressures. Eg, at 100.73K and 817kPa. Can anyone please point me in the right direction ?

Partition separates two gases in a rigid well-insulated container. Q=0, W=0. State 1: Air: m=1kg P=500kPa T=350K CO_2: m=3kg P=200kPa T=450K Assume constant specific heats. Assume kinetic and potential energy changes are negligible. Assume the partition between the two gases...

Is there an easy way to prove that for any irrational \xi the set: \{x \in \mathbb{R}: x = p + q\xi, \ p, q \in \mathbb{Z}\} is dense in \mathbb{R}? I know a proof involving notions from measure theory of which I unfortunately know nothing about. Any help would be very appreciated.

Homework Statement water at 500 kpa and 20 degrees CelsiusHomework Equations how do i find the specific volume?The Attempt at a Solution my charts only give me specific volume at the saturation points, but i know this is below any saturation point, so I've hit a road block

hi, am new in this forum thing, from Malaysia, currently pursuing South Australian Matriculation, graduating in 2010. I would like to major in physics and later be a lecturer whilst conducting researches. Would prefer to study overseas. Which university or college would be suitable with the...

I'm in my first ever Physics class and have a few questions concerning skills involving solving Physics problems. I've been noticing that even though I get the right answers, my work getting there is a mess and unorganized. With that said, I have a hunch that won't fly in the upper level...

Hi all, I'm having some issues with Matlab. I'm running ode45 inside a function which is called repeatedly in a finite loop. As it is being called, Matlab is plotting and saving the data externally. Here's a quick pseudo-code func1 ( ) loop { data = func2 (variables) save...

Hi, 1. \color{blue}dq=dU+PdV so C_V = \left(\frac {\partial q}{\partial T}\right)_V= \left(\frac {\partial U}{\partial T}\right)_V leads to dU=C_{V}dT so \color{red}\left(\frac {\partial U}{\partial V}\right)_T = 0 meaning that internal energy of NONideal gas is a sole function of T? 2. As...

Homework Statement A hydrogen atom is in a state with energy -0.278 eV. Homework Equations L = nh' The Attempt at a Solution The answer book says to do E_n = (-13.6 eV)/n^2 but I can't find this equation in our book. Is the 13.6 a significant number or just a different number...

Homework Statement [PLAIN]http://img545.imageshack.us/img545/5494/61141879.png The answer is 2, but I just can't figure out how to get to it. Homework Equations none The Attempt at a Solution Tried all methods taught in school but none works. Adding related expression...

Homework Statement From Giancoli's UC Berkeley edition Physics for Engineers and Scientists: A 2.00 mole sample of N2 (nitrogen) gas at 0 degrees C is heating to 150 degrees C at constant pressure (1.00 atm). Determine the heat added to it.Homework Equations Variables in equations: V = volume...

1. A Cube of lengths 5cm each. The cube weighs .54kg. What is its specific weight? 2. Answers: A)6 g cm3 B)3 g cm3 C) 2.5 g cm3 D) 2 g cm3 3. 5x5x5 = 125cm3 540g/125= 4.32 g cm3 which is none of the above. Could someone verify that I'm correct before I make an idiot of myself when...

Homework Statement The acceleration of point A is a = -5.4sin(kt) ft/s2. k = 3 rad/s. When t = 0, x = 0 and v = 1.8 ft/s. Determine the position and velocity of point A when t = 0.5s Answers: x = 0.598 ft v = 0.1273 ft/s Homework Equations...

I am not an expert in math, but as an electronics tech we use sinewaves all the time. I understand how it is derived from a circle well enough ( a phasor rotating about a circle). And that makes sense as that is how electricity can be generated due to the orientation of the generator...

I'm fascinated with physics and probably know at least the nature of any effect or object in classical physics, but um... I have never in any textbook or article seen mention of what determines the specific heat capacity of a given substance. Which is kinda peculiar and confusing at the same...

Hello all, I have been thinking about a particular mathematical question (that I've made up) and I haven't been able to reach a solution yet.. I want to find the rule for the function F(x,y) which gives the number of different "ways" that the integer x can be expressed as the summation of...

Hi Everyone :smile: I have to create an experiment for my assignment in Physics. I've chosen to do something about Specific Heat Capacity. A boy in my class is also doing SHC so I wanted to make mine a little different from his. I've just recently joined physics (never done it before)...

I've been clawing at my mind for a while regarding this, I pray somebody can help me. I was implementing a method from a computer science paper when I came across this: [PLAIN]http://www.mattkent.eu/challenge.png Bearing in mind that x is a vector, epsilon is a vector of integers (and...

Hi!, I'm well into the world of computer graphics. Love to say it was great but well, it isn't. I would like to know how I can take any object and have it orientate so its centre aligns perfectly with any arbitrary axis. Think of a cylinder at the origin pointing down the x-axis. Well I...

I have read the entire chapter in my book and have searched the internet and I still have no idea where to even begin. HELP! 4. a.) Explain the significance of a probability of 1.0 and of a probability of 0.0. b.) Calculate the probability for an event to occur if 420 events have...

Hi Physics Forums! I'm brand new here, My name is Randy. I recently decided not to re-up in the army and instead attend collage full time. I'm currently a student at Devry, But I've decided that physics is more than a lifelong hobby, it's something I could do everyday and be a happy and...

I would like to know the three dimensional velocity and position of the Earth with respect to the solar system center of mass at a few specific times. Similar data for the planet mercury and the moon would also be very helpful. Is there a web cite that where I could find the data...

Ques 1) In determining and then using the specific heat of any substance:- For solids and liquids, we usually assume that the sample is under constant pressure during the transfer, or at constant volume while the heat is absorbed. Then is it possible that the thermal expansion of the sample can...

In thinking about specific heat, I have been unable to resolve a particular issue. If molecules in a substance are bumped and move faster, then they will measue to be at a temperature proportional to the speed they are moving which is a consequence of how hard on average they were hit(heat...

Homework Statement http://farm5.static.flickr.com/4117/4775531139_8d4dd954f5_b.jpg Homework Equations I = V/R E = I1R2 = I2R2 =I3R3 The Attempt at a Solution I got 5.22 ohms for part (a), but I'm not sure how to go about calculating the amps through a specific resistor.

This is not a homework question. This is the result of trying to think of a way to remove seasons. Imagine a case where the Earth's axial precession had a period of exactly one year (instead of about 26,000 years) and that such a precession was counter clockwise (matching the direction of the...

Homework Statement The temperature at the top of a popular waterfall is 22.0 degrees celcius. The temperature at its base, 210 m lower, is 22.5 degrees celcius. 1)Caluclate the specific heat capacity of the water. 2) If the waterfall was twice as tall, determine by how much the water...

This question pertains to the (non)relationship between thermal conductivity, specific heat, human perception and thermosensors. Here goes: Let's say I place four thermosensors on my body. Then, on top of these thermosensors I place four different items (A, B, C, and D). All four items start...

I'm working through a derivation of Einstein's formula for specific heat and I'm stuck. So far I've been working off Planck's assumption of quantised energy E=n\hbar\omega and the energy probability P(E)= e^{\frac{-E}{k_b T}} , using the fact that the mean expectation energy is \langle E...

I'm working through a derivation of Einstein's formula for specific heat and I'm stuck. So far I've been working off Planck's assumption of quantised energy E=n\hbar\omega and the energy probability P(E)= e^{\frac{-E}{k_b T}} , using the fact that the mean expectation energy is \langle E...

Homework Statement The following question is from ExamKrackers Physics [an MCAT prep book]. An ideal fluid with specific gravity of 1.0 is passed through a pipe. Along the length of the pipe shown above are attached 3 vertical pipes which are sealed off as shown above. If now a different...

Homework Statement How would you calculate the voltage at a specific resistor given that it's a parallel circuit.

1. Homework Statement What si the difference between the molar specific heat at constant volume and at constant pressure? Homework Equations The Attempt at a Solution

Hey, i have an assignment in MATLAB class which is Let L be a linear transformation such that L(1)=(2 -1)' L(1-x)=(1 0)' L(1+x^2)=(1 1)' L(1+x^3)=(1 2)' Determine a matrix in domain such that with the canonical in range, the matrix that represents L has two null columns. I don't know...