Qualification > Sciences
A2 CIE PHYSICS (9702) - PAPER 5 - DESIGN QUESTION
leebux101:
cant we just turn the pegs of a guitar and attach a newton meter to it?
secondly can someone PLEASE explain ON09 P51 q1 and with a diagram if possible please! =(
aldehyde1612:
--- Quote from: leebux101 on May 21, 2011, 03:13:45 pm ---cant we just turn the pegs of a guitar and attach a newton meter to it?
secondly can someone PLEASE explain ON09 P51 q1 and with a diagram if possible please! =(
--- End quote ---
that actually seems smarter :P .. how do you find the frequency tho?
And what exactly do you need help in that?.. its easier that way. instead of writing up the whole thing- cause you could just look at the marking scheme?
I attached a paint version of the diagram I drew which my teacher said was okay.
leebux101:
--- Quote from: aldehyde1612 on May 20, 2011, 03:19:29 pm ---Just a heads up... people may take a while to reply.. because if theyre like me- they havent done the papers before 2006. :-\
But I'll have a go anyways :D. In simple.. for the experiment I'd probably have a signal generator attached to a vibrator connected to the string. The string would be in a pulley system with a known wieght attached to the end (can find tension from that). For different masses (tensions), vary the vibrations until a max amplitude is seen.. the frequency that it occurs at is the resonant frequency. Record the resonant frequency and tension.. construct a graph- tension on x-axis and frequency on y-axis. right? And the controls- same mass per unit length of wire.. same length of wire (basically same wired used) for each tension... but the thing im stuck on is -would you have to change the lengths to keep it at the fundamental mode for each tension?? TBH- i cant remember what the fundamental node is. :P and safety - i dont know?- maybe ear protection incase of high pitch frequencies?
hope i helped in some way. sorry if its vague.. its just off the top of my head.
--- End quote ---
how would u measure the resonant frequency?
leebux101:
--- Quote from: aldehyde1612 on May 21, 2011, 03:33:38 pm ---that actually seems smarter :P .. how do you find the frequency tho?
And what exactly do you need help in that?.. its easier that way. instead of writing up the whole thing- cause you could just look at the marking scheme?
--- End quote ---
actuallyy i wouldnt apply the guitar method cuz turning the pegs would vary the length of the wire. ur way is better, but i dont underatnd how u wud calculate the frequency? secondly i dont understand the marking scheme for ON09 , so if u cud gimme a diagram, it'll be very helpful. =)
aldehyde1612:
The signal generator thing would give you the frequency? .. or.. you attach that to a CRO with a known timebase scale- and read off that?
I edited my previous post with a shifty diagram. lol. its easier than getting my scanner out. :D
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version