Specific Definition and 1000 Threads

I was wondering how I would go about working out the energy required to cut a material (e.g. stone or steel) if given a volume, and all the necessary values pertaining to that specific material? For example, how would I work out the amount of energy required to cut a steel block of dimensions...

A bottle has a mass of 33.00 g when empty and 97.55 g when filled with water. When filled with a mystery fluid the mass is 84.02 g. What is the specific gravity of the mystery fluid? Hopefully helpful equations: p = m/v (p = density, m = mass, v = volume) SG = 1000p Attempt: I'm...

Please help me qualitatively in the following points : 1) If in a system(consider a cylinder) fixed with a piston , if the piston is moved suddenly then how can a process be adiabatic. 2) I understood that the process would be irreversible but, if the process is adiabatic then is the relation...

Hello all, I realize this isn't exactly the correct place to post this, but I can't start a thread in the mathematics learning forum, I'm not sure if I am supposed to be able to or not. I realized that I threw away one of my instructors math books on Fourier Theory I was borrowing over the...

I'm trying to find specific reaction cross section 18O(p,n)18F in proton + O-18 TENDL (ENDF format). # p + 18O : (p,n) Total # Q-value =-2.51902E+00 # E-threshold= 3.64964E+00 # # energies = 45 # E xs 1.000E+00 0.00000E+00...

When two substances have the same temperature, the particles have the same average kinetic energy, right? So why is it that some substances take more energy to increase the temperature one degree even if the increase in average kinetic energy is the same? I'm referring to specific heat...

Homework Statement the answer is c) but i can't figure why ! is the more heat capacity substance lose and gain energy faster than the other one so it take more energy to get it's temperature raised by the same amount because it lose most of it very fast during the heating process ?

Homework Statement Download the mat file Gettysburg.mat. View in a new window and load it in the workspace using the command clear; load Gettysburg; This loads a 1-by-1452 char array GA that is the Gettysburg Address in English. Display the first 100 or so characters for yourself to see this...

I have been conducting a lab to find the force of a spring by calculating the oscillatory motion of the period. Each time i added a mass, i gained a higher spring constant, but on the 250g i ended up losing spring constant. I was wondering if anyone know why, or if i have done something wrong...

I have been looking for specific heat capacities of certain materials such as steel but i can never find a solid answer, so i figured i would test it myself, how would one test specific heat capacities?

I'm running a simulation on a gas mixture that spits out its Specific Heat in a number of different units. The values for Specific Heat in Btu/lbmolF vs Btu/lbmolR are the same, which confuses me at first glance. I sort of remember in Thermo not having to worry about Btu/lbmolF vs...

Hey I am a physics student, and not so familiar with chemistry. I have a huge problem, because I have to find the following 3 values for liquid isopropanol: 1. The specific heat capacity at constant volume 2. The specific heat capacity at constant pressure 3. Volumetric Isobaric...

I have been struggling with one simple question. How can one measure the momentum of a particle within a field without disrupting the entire field, all together? If the particle is under observation at at t_0, how is it verifiable that at t_1 the same particle is being observed? Obviously spin...

Hi, I'm interested in how light and how electricity works so I'm interested in a beginners (undergraduate level) physics book that has the following: Giving intuition by showing each experimental setup - visually (with ppictures) and mathematically - which contributed to the understanding...

Calculate the change in entropy of the Universe as a result of the following operations: (a) A copper block of mass 0.4kg and thermal capacity 150JK-1 at 100◦C is placed in a lake at 10◦C. dS=dQ/T dQ=mCdT Tried simply combining these equations and integrating to find change of entropy of...

Hi, I am a student looking for a material for a project at school. I am currently studying mechanical engineering so the chemistry and materials aspect is a bit over my head. We're working on a concept to develop a more ergonomic chair and would like to find a material that would be...

I have a list of various organic components I would like to extract from different fruits, vegetables, and plants and get the organic chains as pure as possible. How is that achieved? What science provides insight on the subject? I actually say science, but I'm looking for specific titles...

Homework Statement A point source s emits thermal heat energy H every second uniformly in all directions. A cylindrical container with radius R, which contains a liquid of mass m, is placed at a distance h above the source, look at the picture. After t seconds, the temperature of the liquid...

Hello, I'm really having a problem to calculate the eigenvectors of a specific matrix, I'm used to do this but i don't know why I'm stuck at this one Homework Statement A= 2 1 0 1 0 3 -1 0 0 1 1 0 0 -1 0 3 λ1=2 multiplicity 3 λ2=3 multiplicity 1...

the van der waals equation of state is given by (p+an^2/v^2)(v-nb)=nRT.how to show that for a gas obeying the above equation of state (∂Cv/∂V) (taking temperature constant)=0?

Hi, I was reading about VASIMR ,my knowledge in rocket science is very limited ,i was able to understand how plasma is produced and used for propulsion but i didn't understand how specific impulse is varied and why is it not possible for other (ion)thrusters or even chemical ones to vary the...

In a V-Belt Drive, it is said that when a New Belt is installed, the Tension Ratio shouldn't exceed 5:1. But isn't this ratio beyond control and is defined by T1/T2 = μ*α*cosecβ where T1/T2=Tension Ratio, μ=Coefficient of Friction, α=Angle of Wrap, β=Groove Angle of V-Belt. All of these variable...

I'm 19, aspiring to go into professional physics, most probably in the astrophysics branch. I'm mostly attracted to gravity (please do not mind the pun), quantum mechanics, string theory, the remote possibility of FTL travel using Alcubierre Drives (or better technology, someday), fusion, et al...

So let's say I have 2 matrices A and B. I need to solve 2 eqns involving specific elements of each matrix. e.g. A(1)+B(2)=4; A(1)-B(2)=2. Is there any way to do this? My efforts with Fsolve and solve have failed. Here's what I've done so far: function F=myfun(A,B)...

I have a question about the derivation of the formula for relation between Specific Conductance and Equivalent Conductance i.e. Eq. Conductance = k.V where, k= Specific Conductance ,V=Volume in ml Given link explains the derivation...

Homework Statement A rectangular prismatic box, which is floating on water has a length, L=1200 mm, breadth, b=800 mm, height, h=500 mm, and a mass of 52.00 kg. When the box is loaded with the suspended hexagonal mass, the depth of its immersion is 300 mm, and when the mass is placed inside...

Homework Statement Determine the specific weight of water at a pressure of 100 KN/m2 absolute and 10˚C temperature. Homework Equations I was thinking it's p=γh The Attempt at a Solution But there's no height?

Suppose we have a Markov chain with stationary distributions ##p_n=\frac{a}{nb+c}p_{n-1}## for ##n\in\mathbb{N}## where ##a,b## and ##c## are some positive constants. It follows that ##p_n=p_0\prod_{i=1}^n\frac{a}{ib+c}##. Normalisation yields...

Homework Statement To circumvent the negative feedback needed for thermal stability and to avoid the accompanying reduction of gain, a bypass capacitor CE needs to be placed in parallel with an emitter resistor RE, such as in Fig. 4.14a, cf. Fig. 18a. Determine what capacitor needs to be...

I'm trying to write a contracted general equation for an expandable equation. Just like there's the summation symbol for sums, is there something for multiplying terms? for example.. how do i contract the following? $$C_{i}C_{ii}C_{iii}C_{iv}C_{v}...$$?

what is the specific air consumption equation for a diesel engine?

Homework Statement The probability density function (p.d.f.) of a random variable X is P(X=k)= p^{k} (1-p) \;\;\;\; where \;\;\;\; 0<p<1 \;\;\;\; and \;\;\;\; k=0,1,2,... Question 1: what is the moment generating function (m.g.f.) of X? Question 2: What are expectation E(x) and...

I've finished physics but I'd like to have a certain kind of book. I have this book about math (click the link.) It's written in a very causal style and covers very many topics in a terse way. It's just enough to remind me of concepts when I forget, and it's fun to read. Is there a book...

Hi. For whatever reason I'm really struggling with figuring out the direction of a moment in two dimensional statics problems. How can I tell if it's CW or CCW? The right hand rule just confuses me even more and I cannot find any explanation that breaks it down simply enough for me to...

Hello, I'm a bit stuck with a case in which the curl gives a vector that does not transform under rotation. As an example, let's have a field with only \hat{x} direction (but this does not mean that it's a scalar field!). The field has this expression: F(x,y,z)=...

Hello all, I am a newbie to this site and have found some interesting discussions herein, so I thought it worthwhile asking the collective wisdom of this group about Hygroscopic liquid calculations that I am struggling to correlate. It has been several years now since I worked as an electronics...

have two specific heat questions that I am having trouble with. Though i thought this was a chemistry topic, we are learning it in my physics class as well 1. The specific heat of aluminum is 0.22 cal/g *C What is the specific heat in Btu/lb*F The Fahrenheit is the part that I...

Homework Statement Two copper cylinders, immersed in a water tank at 30.3 °C , contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average translational kinetic energy of a helium molecule and...

Homework Statement I am confused about what the difference between specific heat and heat capacity is. I have a block of metal (Aluminium) which I had to record dimensions and calculate the heat capacity of the block. I am just wondering am I doing the correct calculation? Homework...

Good afternoon, I have created a column vector with many values however I want to know a specific value found in that vector. Specifically I want to know the 99th value of my column vector. Is there a command I can enter into mat lab that will give me the value I seek without having to...

Homework Statement A 30.0g block of ice at 0.00°C is dropped into 500.0g of water at 45.0°C. If the process was carried out in an iron container with a mass of 150g what would the final temperature be? Homework Equations Q=mc(T2-T1) Heat Lost = Heat Gained Specific Heat of Water: 4200 Specific...

Homework Statement http://imageshack.us/a/img850/788/yk72.jpg Find the average power absorbed by the 2Ω resistor in the circuit (pictured above) Homework Equations Average power = (1/2)(Imax)(Vmax)(cosø) x=rcosθ y=rsinθ current division, voltage division The Attempt...

Hello, I know there are many different representations of temperature, there's 4, 1) Fahrenheit 2) Kelvin 3) Celsius then there's 4) T = 460 + F In my fluid dynamics review book To calculate specific weight γ= P(pressure) / (R * T) = lb/ft^3, it explained that T should be...

I am majoring in Mechanical Engineering, and I found a research opportunity I really want (it focus on Fastening and Joining). I want to take classes relevant to this area, but my university offers different areas to specialize in as an Undergrad, so which one should I focus on in order to take...

Traveling on a spaceship to Alpha Centauri A, 4.37 light years away, at a velocity of 0.92 c, if you just calculate the time by dividing the distance by the velocity: t = \frac{d}{v} = 1.496 x 10^8 sec = 4.74 years Is this the time from the Earth reference frame? Then the time on the spaceship...

Hey guys! I'm just wondering do you know where I can see the growth and total money made by an industry like say robotics or petroleum. I just want to see what industry I want to go into when I'm older:)! Thanks

Specific volume is the volume occupied by 1 kg of a material. This part is simple to understand. Say I have some fluid at a temperature and pressure. I can find the specific volume for it by looking at the tables and find its quality. Simple enough. Now let's move to stage two where one or all...

How to make a liquid with specific gravity of 4 or 5?!

Consider the ODE y''+P(x)y'+Q(x)y=0. If \stackrel{limit}{_{x→x_{o}}}P(x) and \stackrel{limit}{_{x→x_{o}}}Q(x) converge, can you call x_{o} a 'regular singular point' besides calling it an 'ordinary point'? I am saying this because if \stackrel{limit}{_{x→x_{o}}}P(x) and...

The problem reads: Consider a gas with constant specific heat cv and the van der waals equation of state (P+ a/v2)(v-b)=RT , where v=V/n A) Find du and the specific internal energy u=U/n B) Find ds and the specifi entropy s=S/n Here's what I've tried so far: A) I took the initial...