Steady Definition and 231 Threads

I have been given the task of building an RLC circuit that is driven at 10kHz, has an output amplitude of 1/sqrt(2) and is 45 degrees out of phase from the input voltage. I am not really even sure where to get started. Any tips will be greatly appreciated.

Homework Statement Homework Equations The Attempt at a Solution According to my notes when a circuit is in DC steady state inductors are short circuited and capacitors are open circuited. This leads me to believe that the voltage across the capacitor is basically the voltage looking in through...

Homework Statement A fire in a room rapidly raises the temperature of the surface of the wall to a steady value of 1000°C. on the other side of the wall is a large warehouse, whose ambient air temperature is 20°C. If the wall is solid brick, 200 mm thick, with thermal conductivity of 0.72...

Homework Statement a man of mass 70kg rides a bicycle of mass 15kg at a steady speed of 4 ms-1 up a road which rises 1.0 m for every 20m of its length. what power is the cyclist developing if there is a constant resistance to motion of 20N Homework Equations (P= F*V) , ( p= W/t) The...

Homework Statement consider a system with a damping force undergoing forced oscillations at an angular frequency ω a) what is the instantaneous kinetic energy of the system? b) what is the instantaneous potential energy of the system? c) what is the ratio of the average kinetic energy to the...

I am trying to find the indicated currents for the following circuit, given v1 = 2sin(2t + 45): I attempted to solve it in the following way: v1 = 2sin(2t+45) // given = 2[sin(2t)cos(45) + cos(2t)sin(45)] = √2[sin(2t) + cos(2t)] I use a matrix for the loops: A = [2 -1 -1 -1 3 -1 -1 -1 3]...

Force exerted on U-shaped pipe by steady air-flow... help please! :) Hello! I have attempted this problem, and my result makes sense in my twisted mind. However, it seems like it came too easy! Homework Statement Consider a length of pipe bent into a U-shape. The inside diameter of...

The model I have is very simple it is: a(t) = A * (exp(H t) - 1) where H^2 = (8 Pi G /3 ) rho_min and A is just a factor to make a = 1 at the present time t_0: A = 1 / exp(H t_0 - 1) and rho_min is the limiting density of matter in the Universe for large t. The model...

Hey guys/gals, The block diagram attached is a PI controlled robotic joint system where: G(s)=Kp+(Ki/s) P(s)=48500/(s^2+2.89s) R(s)= joint’s desired angular position C(s)= joint’s angular position D(s)= external disturbance G(s)= PI controller ess= Steady State Error My...

as atoms are doing motion and due to any reason if this motion stops and they becomes steady than what happens?

Hi all, I have a system which involves a ventilated box with a heat source located inside, if the heat source inside is say 1KW and I know it eventually reaches a steady state, in an ideal world it would reach this steady state by effectively ventilating 1KW of heat through the opening and...

Homework Statement R1 = 29 ohm R2 = 23 ohm f = 60hz L = 20mH C = .1uF Is = 27A K = 12 See picture for circuit.Homework Equations KCL, KVL, is = Is cos (wt), V = IZ The Attempt at a Solution I first did a source conversion to volts then tried to love using KCL and the nodal method. When I...

I want to calculate the time it takes for a spherical sample (radius, r) to reach thermal equilibrium in an oven where the temperature is held constant. I don’t need a super accurate answer, within 5-10 seconds is sufficient. Is it reasonable to simply say that when the Fourier Number (Fo) is...

Homework Statement U_t = u_{xx} - 4U u_x (0, t) = 0, u_x (\pi, t) = 1 u(x, 0) = 4cos(4x) Find a steady state solution to the boundary value problem. Homework Equations n/a The Attempt at a Solution Well I'm quite comfortable solving dirichlet/ mixed boundary value...

Homework Statement Homework Equations The Attempt at a Solution I'm trying to find the steady state solution to the heat equation for a system of spherical shells (looks like http://correlatingcancer.com/wp-content/uploads/2009/01/nanoshell-thumb.jpg" ) where heat generation Q occurs in...

Homework Statement determine the steady state equation for the given heat equation and boundary conditions Homework Equations Ut=Uxx-4(U-T) U(0,T)=T U(4,T)=0 U(x,0)=f(x) The Attempt at a Solution I put Ut=0 so 0=UInf''-4(Uinf-T) then once I tried to integrate I ended up with a...

I am trying to figure out the relationship between the air pressure inside of an inflated bladder and the diameter of the outlet with a fixed inlet flow rate. The inlet is fed by a blower which is delivering 600 scfm to the system through a 4" diameter inlet. The bladder is large, it is...

FAQ: What is the evidence on Big Bang versus steady state cosmologies? Let's consider this question first under the assumption that general relativity and standard quantum mechanics are valid. (Both QM and GR have been verified to high precision by a wide variety of empirical tests.[Will])...

1. If the coefficient of kinetic friction between a 30 kg crate and the floor is 0.26, what horizontal force is required to move the crate at a steady speed across the floor?Fp is the pushing force. 2. Homework Equations ΣFx=max ΣFy=0 Ff=μkFn solving for Fp I get... Fp=max+Ff The Attempt at...

Hallo everyone, I am trying to find the way to solve the vertical diffusion equation for a spicies X in the atmosphere for steady state conditions (dc/dt=0). The equation has the form, dJ/dz -P+S=0 where J =(vs*C(z)) + rho*kz*d/dz(C(z)/rho(z)) is the flux of spicies X at height z...

consider and determine the steady state solution of the differential equation below. dy/dx = y(y-1)(y+1) We can separate the variables, break the integrand into partial fractions, and integrate the fractions easily. Solving gives y = the square root of 1 / (1 - e^(2t)). as t goes to...

Please Help me with this problem or with understanding it. Thank you! Homework Statement What is the stead-state value of Vc after the switch opens? Determine how long it takes after the switch opens before Vc is within 1 percent of its stead-state value. Homework Equations Vc = Vie-t/RC...

In developing Mazwell's equations in media, we considered the total charge as consisting of free and bound charges and currents, so that ρtot = ρf + ρb and Jtot = Jf + Jb The bound current maybe furhter divided into magnetization and polarization currents Jb = JM + JP ,expressed in terms...

I have two questions. Why did Einstein think the Universe was steady (unchanging)? What were his motives? And two: To make his universe steady (static) Einstein added the cosmological constant to his Theory of Relativity. Later he said that adding the cosmological constant was his...

Homework Statement The system's closed loop transfer function is given below, find K and \alpha such that the input R(s) = 1/s^2 has no steady state error. (Hint: the system is not a unit feedback system) http://img829.imageshack.us/img829/9899/problempr.png Homework Equations not sure...

Homework Statement I am trying to solve the Laplacian Equation with mixed boundary conditions on a rectangular square that is 1m x 1m. Homework Equations \nabla2T=0 .....T=500K ....________ ....|@@@@| T=500K...|@@@@|...T=500K ....|@@@@| ....|______.| ....Convection ....dT...

Steady state is defined as the state at which at the temperature attained becomes constant. To say, there is no decrease or increase in temperature. It can also be defined as the state where the heat generated is equal to the heat dissipated. I have been capturing thermal images of a bearing in...

Hi, Can anyone explain what the steady state of a electric/electronic system is? as well as its significance and importance? is it the same as a dc steady state?

My partner and I are working on a quadcopter, but we can't seem to find the correct equation we need for the counteracting steady state torque that is applied by the chassis to the motor. Obviously it would have the same magnitude of the state state torque of the propeller, but in the opposite...

1. A battery drives an electric motor which raises a 20 kg mass at a steady speed of 3m/s vertically upwards. If 90% of the electrical energy supplied is converted to mechanical energy and the current flowing is 5 A, find the emf of the battery. 2. W=QV p=mv P=IV K.E=.5mv^2 3...

I an working on a problem in the text "Mechanics and Thermodynamics of Propulsion" 2e. The problem states a perfect gas with molecular weight M=20 and a specific heat ratio of Y=1.2 expands adiabatically in steady flow from a pressure of 6MPa, a temperature of 3000K, and a velocity of 200 m/s...

Hello Why ds=0 only in a steady rev. process? Can't it be zore for a rev. and not steady process? And if the process isn't rev. but still circular. since the entropy is still a state function it should still be zero if we come back to the starting point ,right? if it isn't true then dU...

Hi, I know that the a constant magnetic field is created by a loop of DC. Steady current does not create any EM waves. At the same time, it is told that an electron orbiting around an atom should emit an EM field. In both cases we have a loop but in one case no radiowaves are emitted, in...

Homework Statement There is a wall 100 mm thick, find the U-value. Then a plasterboard lining is added of thickness x and a gap between it and the wall of 20 mm wall thickness b=0.1m, thermal conductivity \kappa_1=0.5 W m^{-1} K^{-1} plasterboard thickness xm, thermal conductivity \kappa_2=0.1...

Hey all: I am taking a Thermodynamics course and we are studying work and heat through surfaces (i.e. conduction, convection, and radiation). I was given an assignment and I am having trouble arriving at the correct answer. I have scanned the question and the works I have so far. I hope...

Ladies and gentlemen. I have been trying for literally days on this problem and its completley done me in. The problem is as follows. I have to evaluate a jet engine using the SFEE equation. So far I have concluded that this equation will be the best to use... Qr – Wrx = ṁ Δ [ h...

It is known that on a wire carrying steady current there are surface charges (and hence electric field outside the wire, but let's forget about it). This surface charges play an important role to maintain a uniform electric filed along the whole wire. There are only few geometries for which one...

When charges are flowing (current) through a combination of conductors of different resistances in series, then why don't the charges flow faster(more current) in the material with lower resistance and slower(less current) in high resistance material? Why is the current same(steady) in the whole...

I have a question (possibly dumb) if someone could humor me with an explanation . I understand that steady currents don't create electromagnetic radiation. If that's true how does a high-voltage steady DC current create interference? For that matter why does a high voltage capacitor create...

Ok, I'm lost. I've an exam coming up so could so with a speedy reply. This whole transition matrix stuff is not explained at all in our lecture notes. Here's an example question: "Suppose that a country has a fixed number of voters, all of whom vote for either party D or party R. Every...

This is a simple question. I know the equation I am supposed to use but I can not get my head around one part. The part in brackets! I keep getting wild numbers as my answer The equation is :- I = V/R * (1 - e^t*R/L) can I ask someone to give me a step by step example of how you place...

This paper http://arxiv.org/abs/1003.0658 nails down the interpretation of a binary white dwarf system with an orbital period of only 5.4 minutes, versus 8 hours for the celebrated Hulse-Taylor binary neutron star system. This would probably be the strongest source in the sky of steady...

Homework Statement Question 3 of http://www.damtp.cam.ac.uk/user/examples/B10b.pdf . Homework Equations \nabla \times B = \mu_0 J The Attempt at a Solution I know for a cylinder, J (vector) = J (scalar) * k (vector), where unit k is the vector in the z-direction. So \nabla \times...

I have a set of ODE of the following form \begin{cases} \displaystype{\frac{dx(t)}{dt}} = F(x, y, z; \delta e^{i\omega t}, \Delta e^{-i\omega t})\\[4mm] \displaystype{\frac{dy(t)}{dt}} = G(x, y, z; \delta e^{i\omega t}, \Delta e^{-i\omega t})\\[4mm] \displaystype{\frac{dz(t)}{dt}} = H(z...

Uncle Sam claims that he invented a black-box device which operates at steady state, and has two inlet streams and one outlet stream as shown in the figure below. Inlet 1 allows air to enter at a pressure of 200 kPa, temperature of -50 oC, and mass flow rate of 30 kg/min. Inlet 2 allows air in...

If an object receives heat from a heat reservoir, is it necessary for the heat receiver to release heat? Can the heat receiver increase its internal energy without heat flow out of the receiver? And what happens when the system between heat provider and heat receiver reaches a steady state...

Homework Statement Using cylindrical coordinates rho,phi, and z, let u([rho,phi) denote steady temperatures in a long hollow cylinder a leq rho leq b, -infinity < z < infinity when the temperatures on the inner surface rho= a are f(phi) and the temperature of the outer surface rho = b is zero...

Homework Statement A 50mm wafer, 2mm thick is implanted with Boron at 100keV and 1mA. Considering only conductive cooling, given that thermal resistance is 10K/W, to room temperature of 25oC, determine the steady state wafer temperature and also the time constant for heating Homework...

Problem: Find the steady state temperature of a laterally insulated rod subject to the following conditions. Length of the rod 10, , left end kept at 0 and right end at 100 Solution: i got this equation from a book i don't know if this applied to this problem but i don't know what to do...

Problem 1 : Find the steady state temperature of a laterally insulated rod subject to the following conditions. Length of the rod 20, left end insulated and right end held at 100 I am not sure if i fully understand this problem, is this asking me to list the Boundary value conditions ? like...