Recent content by interxavier

I'm thinking of doing graduate school in the near future and was wondering whether I should go for power or communications for electrical engineering. I am interested in both fields so the work load won't really be a problem. What I am interested in is the pros and cons of doing either field...

Does that mean I take the conjugates like this: R^{*} = 1 - \exp{(-j \omega)} - \exp{(-j2 \omega)} - \exp{(-j3 \omega)} - \exp{(-j4 \omega)} or R^{*} = 1 + \exp{(j \omega)} + \exp{(j2 \omega)} + \exp{(j3 \omega)} + \exp{(j4 \omega)}

I'm trying to find the magnitude. If I use euler's identity, then I would get multiple values of sin's and cosine's: R(j \omega) = 1 + \cos{(\omega)} - j\sin{(\omega)} + \cos{(2\omega)} -j\sin{(2\omega)} ... How do you find the magnitude of that?

Homework Statement I'm asked to find the magnitude of the following complex function: R(j \omega) = 1 + \exp{(-j \omega)} + \exp{(-j2 \omega)} + \exp{(-j3 \omega)} + \exp{(-j4 \omega)}Homework Equations NoneThe Attempt at a Solution I did the following but got stuck immediately as I'm not...

Homework Statement I'm asked to find the magnitude of a complex function R(jw) = 1 + exp(-jw) + exp(-j2w) + exp(-j3w) + exp(-j4w) R(jω) = 1 + \exp{(-jω)} + \exp{(-j2ω)} + \exp{(-j3ω)} + \exp{(-j4ω)} where ω is the angular frequency j is the imaginary number j = \sqrt{-1} and \exp(-jnw)...

Homework Statement F(s) = (s + 1)/(s2 + 1)2 Homework Equations The Attempt at a Solution I used partial fractions but I still end up with a term that includes a (s^2 + 1)^2 in the denominator. I'm pretty much lost at this point.

Okay, the energy of the electron, because it's in state 4, is E4 = -Eo/4^2. What about the photons? I know the energy of a photon is E = hf but how do I apply this to the problem?

What am I supposed to do in this problem?

Homework Statement An electron is trapped in an infinite square-well potential of width 0.5 nm. If the electron is initially in the n = 4 state, what are the various photon energies that can be emitted as the electron jumps to the ground state? Homework Equations The Schroedinger...

Homework Statement Consider a ball of mass m on the end of a string of length l. It hangs from a frictionless pivot. The ball is pulled out so that the string makes an angle thetai with the vertical and is then released. a. Find w (angular velocity) as a function of the angle the strings...

Homework Statement Suppose you are driving a car around in a circle of radius 200 ft, at a velocity which has the constant magnitude of 20 ft/s. A string hangs from the ceiling of the car with a mass of 2 kg suspended from it. What angle will the string make with the vertical? (Away from the...

Homework Statement A frictionless track contains a circular section of radius R as shown. What is the minimum height at which a block must be started in order for it to go around the loop without falling off the track? Homework Equations V = r*w Fr = m*v^2/r = m*r*ω^2 The Attempt at...

Homework Statement A hollow box, mass M, rests on a frictionless surface. Inside the box is a spring, spring constant k, attached to one wall. A block, mass m, is pushed against the spring so that it is compressed an amount A. a. If after leaving the spring the block has velocity of...

Homework Statement A bullet is shot into the air with muzzle veloity Vo at an angle θ with the horizontal. Use energy considerations to find a) the highest point reached and b) the magnitude of the velocity when the bullet is at half its maximum height. Homework Equations Vx = Vo*cos(θ)...

Homework Statement A particle can only move along the x axis. Forces act on it so that its potential energy function is U(x) = 1/2*k1*x^2 + 1/4*k2*x^4 where k1 and k2 are positive. The particle is started at x = a with zero velocity. a.) Where is the velocity a maximum? What is its magnitude...