IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Reference Material => GCE AS & A2 Level => Revison Notes => Topic started by: Saladin on November 25, 2009, 06:28:42 am
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Please give me a good animated version of he Searle's Young Modulus measurement apparatus.!!
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Please give me a good animated version of he Searle's Young Modulus measurement apparatus.!!
http://www.tutorvista.com/content/physics/physics-iii/heat-and-thermodynamics/searles-apparatus.php
Just wait for it to load - if you have a slow internet connection.
[[EDIT]] :: This is just FYI.
Searle’s method for finding the Young’s modulus of a wire
Searle’s method uses two wires of the same material, one of which will be loaded with various weights.
E = \frac{F l}{A x}
E = (http://upload.wikimedia.org/math/d/e/1/de14524ee2421ac87d37804f5d14bd7a.png)
To calculate Young’s modulus we need to know:
* The cross-section area of the wire (A). This is measured by using a micrometer to determine the radius of the wire, and then using the formula area of circle = ?r2. The radius must be measured in metres, and is typically 2 x 10-4 m. This gives an area of 1.26 x 10-7 m2.
* The length of the wire (l, measured in metres).
* The force and the extension.
* The weight of a 1 kg mass is 9.81 N.
We plot a graph of the extension (m, horizontal axis) against the weight (N, vertical axis).
The gradient of this graph (change in vertical measure / change in horizontal measure) is the ratio F/x. If we multiply this ratio by l and divide by A we have the Young modulus for the wire.
Measuring the extension:
The ‘business end’ of the apparatus is a device which holds the two wires parallel, and allows the extension of the loaded wire to be measured.
(http://upload.wikimedia.org/wikibooks/en/8/85/Searle%27s_apparatus.gif)
Searle's apparatus for measuring Young modulus.
You need to label this diagram to show:
* Constant mass attached to stress the reference wire.
* Variable mass attached to stress the test wire.
* Flexible connectors.
* Level reference from one wire to the other.
* Thumbscrew with scale to level the reference.
* Clamps for wires.
* Reference wire.
* Test wire.
Advantages of this apparatus:
* Thermal expansion of the test wire is correct by thermal expansion of the reference wire.
* Long, thin wires allow maximum extension for minimum force.
Problems:
* Difficulty measuring the cross-section area.
* Extensions very small.
* Mass, not weight, is measured.
* Need high, secure mounting point unless apparatus adapted.
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you get this stuff if u type searle's apparatus in google, i wanted a good and labelled diagram of it.
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Uh. You asked for :
Please give me a good animated version of he Searle's Young Modulus measurement apparatus.!!
So I posted an ANIMATION/video about it.
http://www.tutorvista.com/content/physics/physics-iii/heat-and-thermodynamics/searles-apparatus.php
Just wait for it to load - if you have a slow internet connection.
Plus I have no clue about this subject so it was just my 2 cents.
pz
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its not the apparatus i want. it is an appartus for thermodynamics, i wanted the one that can measure the extension of a wire.
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its not the apparatus i want. it is an appartus for thermodynamics, i wanted the one that can measure the extension of a wire.
No idea then. ;)
Google's your friend.