Recent content by calvert11

Homework Statement Make a change of variable that transforms the quadratic form with no cross-product term: 9x1^2 - 8x1x2 = 3x2^2 Homework Equations A = PDP^-1 Q = y^TDy The Attempt at a Solution I know the answer. This is a question regarding concept. The eigenvalues for...

Homework Statement Find Vo http://img148.imageshack.us/img148/885/opamp.gif Homework Equations Not known The Attempt at a Solution I understand how to find Vo. What I don't understand is where that 6/7 came from (boxed in blue).

Homework Statement Sketch the output waveform: http://img7.imageshack.us/img7/3774/recgraph.jpg (The coloured lines I added myself)Homework Equations Nothing which applies, I think. The Attempt at a Solution The answer has already been provided. I just have a concept question. The full...

Thanks for the help. I would just need to use the period T, right? Which would be 1/100. So the time scale would be in centiseconds?

Homework Statement Design a full-wave rectifier that converts 110 [V], 100[Hz] ac electricity from a regular wall socket to a low DC voltage. a) (Fill in the blanks) To lower the voltage from 110 [V] to 11[V], we use a _________, with a turn ration of ___:___. The units of the horizontal...

Homework Statement Given the electromagnetic wave traveling in the y direction at velocity c: B = +cEo sin(k y − ω t) ˆi. a) What happens to the ratio of the electric to magnetic field if the angular velocity ω of the wave is decreased? Does it decrease, increase, or remain the same...

No, I found the integrating factor to be \frac{e^t}{t^2} lol yeah. that was a silly question. So would y(0)=0 have no solution then? Sorry, I'm really unaccustomed to using the layout tools here so please bare with me. This is "in general" what I came up with before putting in the initial...

Homework Statement Solve the IVP. Is your solution unique? Explain. ty' + (t-2)y = (t^4)*(e^t) y(0)=0 Homework Equations Theorem: If p(t) and g(t) are continuous functions on an open interval a< t < b and the interval contains t0, then there is a unique solution to the IVP on...

Thank you, this explains a lot. My answer would have been "pd = I*XL" but I thought it didn't make sense since it was greater than the source voltage.

Homework Statement A 10 μF capacitor and a 25 H inductor are connected in series with a 60 Hz source whose rms output is 112 V. Find the voltage drop across the inductor. Answer in units of V. Note: Sigfigs do not matter Homework Equations I = V/Z where Z is the impedence XL =...

yeah, Thanks. I got the same answer or thereabouts. After some algebra (and some help) I found that the new area A2 = (n^2)*A1. Plugging that into T = IAB gives the correct answer.

Homework Statement A circular coil of 720 turns and area 0.6 m^2 is in a uniform magnetic field of 0.63 T. The maximum torque exerted on the coil by the field is 0.0026 N · m. a) Calculate the current in the coil. b) Assume the 720 turns of wire are used to form a single-turn coil with the...

That's incredibly helpful. But to clarify, resistors 1, 5, and 8 are actually in series because no current flows through the wire with the capacitor?

Okay, using I= V/R the current for equivalent resistor 6 is 3.333 and for resistor 8 it's 2.5. Voltage at resistor 5 is 3.333*5=16.6665 Voltage at resistor 8 is 2.5*8 = 20 Voltage through the capacitor is 20 - 16.6665 = 3.3335, which is wrong. What about my approach is incorrect?

Homework Statement In the figure below the battery has an emf of 20 V and an internal resistance of 1. Assume there is a steady current flowing in the circuit. http://img48.imageshack.us/img48/9211/44724253.gif Find the charge on the 4 μF capacitor. Answer in units of μC. Homework Equations...