Recent content by Yaaaldi

Homework Statement I'm having a hard time trying to figure out where to start. I know I have to assume the diode states and then calculate if the assumptions work within the circuit. The Attempt at a Solution None as yet because I'm never sure where to start on these circuits...

Homework Statement Say I had x = y-2 / y + 3 How would I go about rearranging for y= ? I can't think how to simplify it down to a single y term.

3.2mA Could you explain why the voltage across the capacitor should be the same as the 15Ω resistor? I can't visualise it from the diagram. Thanks!

Thanks for your help! Here goes another attempt. The total resistance of the right branch is 15Ω. So we have 10||15. Using the current divider equation I got the current going through the right branch to be 4.8mA. Using the current divider equation again I got 1.6mA going through the 30Ω...

So I've made an attempt at part i), but I don't know if it's correct. The resistances on the right parallel side, are 30||15 = 10. Which in series with 5 gives 15 ohms. Then we have 10||15 which gives 6 ohms. This means the voltage going through both branches is 6*12mA = 72mV. This means...

Homework Statement The Attempt at a Solution I'm not really sure where to start with this one. I know that in steady state the capacitor will become an open circuit and the inductor a short circuit. I first changed the current source to a thevenin equivalent of 1.2mV. I don't...

Homework Statement Find the solution when x(1)=2 dx/dt = (x2 - 1) / t The Attempt at a Solution I got all the variables to separate sides: 1/(x2 - 1) dx = 1/t dt However I don't know how to integrate the LHS to get the correct answer. The answer book says: x =...

Homework Statement Find the thevenin voltage and thevening resistance of the circuit. [PLAIN]http://img573.imageshack.us/img573/2525/thevening.png The Attempt at a Solution The posted answers for the question are 5v and 1k ohm. But I can't see how the thevenin resistance is 1k...

Homework Statement You have been asked to measure the width of a slit in a piece of paper. You mount the paper 80.0 centimeters from a screen and illuminate it from behind with laser light of wavelength 633 nanometers (in air). You mark two of the intensity minima as shown in the figure, and...

Homework Statement Light is incident along the normal to face AB of a glass prism of refractive index 1.66, as shown in the figure. [PLAIN]http://img175.imageshack.us/img175/6339/yffigure3336.jpg Find \alphamax, the largest value of the angle \alpha such that no light is refracted out...

Say for instance you created an oxygen free oven, by flowing a gas other than oxygen through it and then heating up that gas. What would happen to things placed inside the oven? Objects won't be able to burn or oxidise because of the lack of oxygen, but what would happen to them? Will objects...

Nevermind.. somehow managed to forget to write the 10 infront of the rR2^2 on the RHS earlier. now have a=1 b=-8 and c=1 Solved to get 7.873 and 0.127 for r and as I know R2>R1 r=0.127 Thanks!

r^2.R2^2 + rR2^2 + R2^2 = 0 For the quadratic equation in terms of r equation I got a=1, b=1, c=1 if I try to solve this I'll get complex roots.. Have I done something wrong?

Homework Statement Two resistors of resistances R1 and R2 , with R2>R1 , are connected to a voltage source with voltage V0 . When the resistors are connected in series, the current is Is . When the resistors are connected in parallel, the current Ip from the source is equal to 10Is Let r be...

Homework Statement Express cos^4Θ.sinΘ in the form asinΘ+bsin3Θ+csin5Θ Homework Equations cosrΘ = 1/2(z^r + z^-r) sinrΘ = 1/2i(z^r - z^-r) The Attempt at a Solution So far I think I have this. 32i(sinΘ)(cos^4Θ) = (z-z^-1)(z+z^-1)^4 I am unsure how to multiply and manipulate...