Diagram Definition and 1000 Threads

When a gas in a closed system is compressed, should the graph always be non-linear? If T is constant ie if the process isothermal it is clear that it should be so but I am not very sure that if the graph can be horizontal. If T decreases might not it be horizontal? Thank you.

Homework Statement Write the shear and moment diagram equations and graph them. Homework EquationsThe Attempt at a Solution I attached my attempted solution in a pdf (I know the last section of the moment diagram is supposed to be parabolic, I accidentally drew a straight line instead). I...

Hi PF I am given the ODE ##\ddot{\theta} +q\sin\theta+\mu\cos\theta=0##, where I introduce ##x_1 = \theta## and ##x_2=\dot{\theta}## to yield$$ \dot{x_2}=-q\sin x_1-\mu\cos x_1\\ x_2=\dot{x_1} $$ subject to ##x_2(0)=x_2(1)=0## and ##\int_0^1\sin x_1\, d t = 0##. I then plug this system into...

I've made a Interative Minkowski Diagram Tool, http://divykjain.github.io/IMD You can add events, connect events and add world lines. Lorentz transformation for moving frames also present. I've added support for frame velocities equal or greater than light speeds(but the animations are a mess...

I posted this in the engineer / comp science thread, but I've had no one reply or help. I really could use some guidance and I don't know where else to post. Homework Statement I am tasked to create a PV Diagram of a Carnot Engine Cycle. I must find pressure, volume, Q, W, ΔU, and ΔS on all...

Homework Statement How to show a block diagram can be simplified to a standard first order form for the diagram shown in the image attached and the question is shown in 1.a Homework Equations Standard first order form K/(1+tD) where K gain and t is time constant The Attempt at a Solution...

Hi, What is the effect of the load cycle frequency on the SN curve (Wöhler curve)? Especially when the frequency matches the natural frequency of the component/material? Instinctively, I would think that at the natural frequency the number of load cycles until fracture is lower than at any...

Homework Statement I am tasked to create a PV Diagram of a Carnot Engine Cycle. I must find pressure, volume, Q, W, ΔU, and ΔS on all four points. This is what has been given to me by my teacher: a to b : Isothermal b to c: Adiabatic c to d: Isothermal d to a: Adiabatic TC = 300 K TH = 1700 K...

Homework Statement The Equation of State and the expression for the entropy for a sample of salt water is given by: V = V_{0}(1 + \beta(T - T_{0}) - \gamma(P - P_{0})) S = S_{0} + C_{v}ln(T - T_{0}) + \frac{\beta}{\gamma}(V - V_{0}) where the subscript 0 denotes a reference state, the...

Hi, I've been learning about gyroscopic precession recently and I feel like I get it. I understand that when the flywheel of a gyroscope is spinning its angular moment plus the angular moment created by the torque from the force of gravity makes it turn. But I were thinking about the forces in a...

Homework Statement In an effort to rev up his class, Mr. H does a demonstration with a bucket of water tied to a 1.3-meter long string. The bucket and water have a mass of 1.8 kg. Mr. H whirls the bucket in a vertical circle such that it has a speed of 3.9 m/s at the top of the loop and 6.4 m/s...

Homework Statement Hi, please see the attached file. I am trying to find the force as illustrated in the diagram. Homework Equations [/B] The Attempt at a Solution I've found the force for the 4deg beam and therefore the horizontal beam however I am unsure how to take into account the...

Is there a way to explain Lorentz contraction on space-time diagrams ? I cannot find a way by myself. Your teaching will be appreciated.

Homework Statement I am given the following interaction, $$\pi^-+p\rightarrow \pi^++\pi^-+n,$$ and asked to draw the Feynman (quark flow diagram). Homework Equations None; just baryon number conservation, quark flavor conservation, etc. The Attempt at a Solution First, as baryon number and...

< Mentor Note -- thread moved to HH from the technical forums to use a scpecific schoolwork problem to illustrate the general concept of torque in a FBD > I'm writing up a lab report for Physics class and I have to draw FBDs for torque being applied to a ruler resting on a pivot point. I've...

Homework Statement Draw a block diagram of 32kx8 bit RAM memory using decoders DEC 3/8 and memory components 8kx8 bit. 2. The attempt at a solution First we find the number of memory components: N=\frac{32kx8}{8kx8}=\frac{2^{18}}{2^{16}}=4. The number of decoders is 32/8+1=5 There are 4...

Hi, Sorry this question may be silly but I have an exam on 11th Feb on machines, maths and electronics. Book had two diagrams for alternator external characteristics. But then which one of 2 diagrams is right? Book says: For zero pf loads, it is seen V(t) = E(f) +/- I(a)X(s) It's minus for...

Hi all, It's written in QFT books, see for instance George_W._S. book "Flavor Physics and the TeV Scale" that the following Feynman diagram (1) is the dominant Feynman diagram for ## b \to s ~l^+l^− ## decay. Actually I compare this diagram via another possible diagram (2) Both (1) and...

Consider the process in the picture below where an ##r \bar r## state goes to an ##r \bar r## state through mediation of a gluon. The gluon may carry the colour anticolour combination ##r \bar r##. I'm just wondering... 1) Can we have a gluon with the colour assignments just ##r \bar r##? If...

http://imgur.com/a/Hg23p 1. Homework Statement In each of the figures below some electric field lines are drawn. But in most cases, there are mistakes. For each drawing, select which of the above rules are broken or if the diagram is essentially correct. http://imgur.com/a/Hg23p Homework...

Homework Statement Everything is in attached file. Given the PV diagram with P2, P1, V2, V1. Homework Equations PV=nRT W=nRT*ln(Vf/Vi) The Attempt at a Solution Attempt in attached file is very organized. I showed 2 of my peers and they are getting the same answer as well. Anybody have any...

I'd like to calculate the matrix element amplitude for## b→s l^+l^−## penguin diagram mediated by Z boson or the photon , like : These calculations are made of course from many time ago, so if anyone has a good reference for such calculations, because it's my first trail in a penguin loop ...

Homework Statement Draw a diagram of the orbit and specify its x and y intercepts. Describe its shape. r = 2bsin(wt)x̂ + bcos(wt)ŷ Homework EquationsThe Attempt at a Solution Heres my picture. Aren't the intercepts just 2b for x and b for y?

I try to solve a block diagram reduction example but when I did the operations, sign of one operation is incorrect. I tried to understand why it is so? Would somebody like to help me. (1) First I carry the feedback into the parallel line. (2) I add +1/G1H1 in the parallel line because I...

Homework Statement In that pin configuration, what does the triangle and rectangle in the middle represent?

Homework Statement From the circuit diagram ( http://postimg.org/image/lldnr7mf7/ ) calculate the net charge flown through the capacitor 2. Homework Equations 3. The Attempt at a Solution [/B] I actually don't need to solve the full problem as i understand how, what i have trouble with is the...

I would like to ask why cannot I think G5 in series with G3(G4+G6G7) and then after muliplying them why I cannot think of G5*G3(G4+G6G7) in parallel to G2 so sum G2 and G5*G3(G4+G6G7) ? Thank you.

I'm finding it a bit too confusing to imagine how it actually would look like. But once I understand that, I'd easily be able to solve the problem! link: http://i.imgur.com/DApJzGx.jpg The attempt at a solution: I'm thinking that the dotted line might be the place where the gears mesh...

Hi all. I got 3 Ohms in this question (top current = bottom current hence equivalent series resistance of top 2 and bottom 2 resistors must also be equal), but is that really the right answer? There is no option for 3 Ohms so I am beginning to doubt myself.

A car is driven eastward for a distance of 50 miles, then northward for 30 miles, and then in a direction 30 degree east of north for 25 miles. Draw the vector diagram and determine the total displacement of the car from its starting point. The relevant equations I used here are: i) rx= ax +...

Homework Statement I am preparing for my final and I am stuck on the following question Homework EquationsThe Attempt at a Solution My best guess would be to make some kind of next state table, but I don't understand the relationship between xT1, yT2, yT3 and any kind of table.

The question is in the title. However my mathematical ability is limited as I am a high school student. Thank you in advance

Homework Statement From first principles show that the relationship between the luminosity, size and surface temperature of a star can be expressed as: $$ \frac{l}{l_0}=(\frac{R}{R_0})^2(\frac{T}{T_0})^4 $$Homework Equations $$L_0$$= Luminosity of sun $$R_0$$=radius of sun $$T_0$$=surface...

Homework Statement Hi Everyone, I am having trouble grasping the concept of Raoult's law, partial pressures etc. One problem in specific is: A system contains 3 moles of methanol and 7 moles of water at 25 degrees celsius. The temperature is raised until there is 40 mol% methanol in the gas...

This isn't a homework question! I posted the question for context purpose. So I understand that at t>0 the switch moves to b. Hence the first circuit diagram (pictured) I understand. However for the 2nd circuit diagram (picture 2) when asked to transform to s domain. Why does this answer...

Homework Statement Plate capacitor is filled with two dielectrics of constants 3 and 4, and with a metal as seen in the picture. If the el. field in the first dielectric is 30 kV/cm, do: a) diagram of el. potential difference with calculated characteristic values using point C as a...

I`m reading some paper about control engeneering. But I don`t know what is feed through term exactly. Is it a connection between some point in one circuit?

Question: Draw the lowest-order Feynman diagrams for the e+e- --> W+W-process The answer gives three diagrams. I understand the first two, but the third makes no sense to me. Here it is: So this is a t-channel Feynman diagram. As far as I can tell regarding how these types of Feynman diagrams...

Homework Statement figure: http://www.chegg.com/homework-help/questions-and-answers/dot-figure-represents-initial-state-gas-isotherm-dot-divides-p-v-diagram-regions-1-2-follo-q5905441 The dot in Figure (b) represents the initial state of a gas, and the isotherm through the dot divides the p-V...

Consider a Carnot's cycle diagram for an ideal gas. It will resemble a square. How do we know which side represents isothermal expansion/compression, which side shows work done by the gas or on the gas, adiabatic expansion/compression and which side represents the heat was added/exhausted?

What would the Free Body Diagram of a Trebuchet look like (FOR THE SYSTEM)? Would it be comparable to a see saw/ teeter totter? I am aware of some of the forces at play, but I feel there is some I am missing.

Hi all, I'd like to calculate the self energy amplitude of the following sunset diagram (take the middle for instance ) can anyone help me in distributing the momentum on the internal propagators ? Best

Homework Statement in this question , I'm asked to draw the bending moment diagram and shear force diagram Homework EquationsThe Attempt at a Solution I don't have the ans for this question , can somoene check thruough my shape of graph . I'm not confident with it . [/B]

Why is this wrong? Does the (v) need to be on the right side? Is this right? Voltage symbol V is measured in |_____ joules (J)| <-- Voltage is a measure of the amount ______<--- volts| done on a unit _____<---?

Homework Statement In this question , the 45N is acting at 0.6m from B ... why the author put the 45N forces at D in the shear force diagram ? Is it wrong ? Homework EquationsThe Attempt at a Solution IMO , the 45N should be put at 0.5m from D . Correct me if i am wrong

Homework Statement Free body force diagram question, where I have selected the best answer but the diagram doesn't ring completely true (see diagram uploaded). I think mathematically the diagram is sufficient but it doesn't properly represent the situation. Do you agree? Homework EquationsThe...

Homework Statement theoretically, bending moment should ends at bending moment = 0 , am i right ? Homework EquationsThe Attempt at a Solution Here's my sketch of SFD and BMD ,my bending moment doesn't return to 0 , which part of my working is wrong ... to find bending moment (M) , i get M...

I have a gut feeling that I will retake a test about these subjects. Do you know good resources about creating ER diagram and relational model for database (sql database primarily) Sometimes even creating a correct ER Diagram (chen notation) feels difficult and confusing. These type of...

I was trying to solve a problem about calculating the probability of failures of a communications link with several nodes, and figured I need to use Demorgan's law since it would involve non mutually exclusive events. So I tried to go back to the basics to make sure I understand the axioms of...

Hi! I have been doing some reading over the past 5 months on spacecraft dynamics and physics mechanics -dynamics . I want to create figures and diagrams such as those found in Orbital Mechanics by Curtis, Vector Mechanics for Engineers by Beer and University P|hysics by Young. Which software...