Hi guys,
Traditional voting via paper ballots at polling stations, meant that each individual was free to vote for his candidate in complete privacy. A father could vote for a separate candidate and a son for another candidate. So I was wondering is there any way in which to ensure similar...
Homework Statement
Determine which of the following protocols are insecure
against replay attack , and explain why:
(a) A → B : username, password
(b) A → B : username, h(timestamp, password)
(c) A → B : username, timestamp, h(password)
(d) A → B : username...
Hi,
Homework Statement
I am trying to determine the size of a molecule..by doing the oil drop experiment where we drop a tiny droplet of oil on water covered with a thin layer of powder...and then make calculations based on the diameter of the circle... the droplet forms in oil.
The Attempt...
ohh i thought u meant without using any microphone...
So i place the mic a distance x from two people who themselves are a distance y between them. Then I ask them to both clap at the same time. and record the distance between the peaks shown on the Oscilloscope?
However, I change x or do I...
So what you are saying is; I connect the microphone to the pre amp. That will amplify the sound waves from the 'clap' and then i monitor the output from the scope?
Hmm..i guess i can clap at increasing or decreasing distances from the mic ?
i tried a simple one by connecting two microphones to the oscilloscope keeping a distance x between them and clapping a distance y from both of them.
But none of my claps, or any music that i played registered any wave fluctuation
Hi.
I have been given the task to measure the speed of sound in air. The materials available are:
1. Microphone
2. Signal Generator
3. Amplifier
4. Digital Oscilloscope
I have looked through google and the simplest exp involves a loudspeaker as well. However I don't have one...
Homework Statement
A particle of mass 4kg is being towed at a constant speed up a rough plane inclined at 30 degrees to the horizontal by a force 4g N acting parallel to the slope. At the top of the slope the particle moves onto a rough horizontal slope with the same coefficient of friction...
Thank you for all the help :)
Ok I was actually working on this question (attached below)
We have to find the current through the resistor R11 after the switch is opened. ( it was shut for a long time prior to it opening at t=0)
Everything is correct but my final answer is wrong...
http://apricot.polyu.edu.hk/~lam/cp/img/rc-circuit.gif" [Broken]
Uhh...so what you are saying is the current goes from the +Vc towards +Vb in anti clockwise direction?
But it won't go from +Vc to -Vc to -Vb to +Vb and so on in a clockwise direction?
Happy new year too you too :)
What did u mean by currents have to go the long way around?
Anyway eventually i agree that there will be no current across a capacitor. But what about while its charging? there will be voltage across it, and shouldn't that mean a current also flows?
In an RC circuit shown below, with the switch closed after a long time, when the capacitor is charging, there is a current across the capacitor given by Initial current x e ^ (-t/RC)...
Is this current...the current supplied by capacitor to the rest of circuit, or simply the current across...
Yungman
I made a mistake above. The current due to the capacitor is 16.666 eLaTeX Code: ^{-t/120} not - 16.666 eLaTeX Code: ^{-t/120}.
However in the book instead of adding the current...they are subtracting them. This is what i don't get since both currents ( current due to the 8V voltage...
Hello,
The circuit attached below is from Richard Dorfs Intro to Electric Circuits book. The switch is shut for a long time and opened at t=0.
The question asks to find the i(t) across R11, which they use nodal analaysis and find it to be 66.67 - 16.666 e^{-t/120} micro Amps, where 66.67 micro...
Ok by drawing a picture the shortest distance between Z and W is coming out too be\sqrt{}74-\sqrt{}13-3=1.9996
I did this by calculating W by \sqrt{}74- 1 and Z by \sqrt{}13 + 2, then subtracted the distance W from Z to get its smallest value.
I would be greatly obliged if someone can...
hmm..I get this part. You are saying that Z and W lie on the circumference of the circle with center 3,2 and radius 2 and center 7,5 with radius 1 right?
I cannot get beyond this point. The question is asking for the minimum value of |z-w| so this means that both Z and W should be at maximum...
Homework Statement
The complex numbers, z and w satisfy the inequalities |z-3-2i|<=2 and |w-7-5i|<=1
Find the least possible value of |z-w|
Homework Equations
No clue at all.
The Attempt at a Solution
Since its |z-w| i figured that the least possible value will only be...
Hi,
I understand that you cannot apply KVL to voltage sources connected in parallel, unless both voltage sources are the same, as this violates KVL.
However, I want to know why? Just a simple 2-3 line explanation will suffice.
Regards