Qualification > Sciences
IGCSE PHYSICS DOUBTS HERE !!!!
elemis:
Calculation of the least count is not a necessity to determining the zero error.
When the jaws are closed you can simply read of the scales and determine the zero error.
SauD~:
--- Quote from: Vin on May 12, 2011, 03:28:45 pm ---okay, there are certain methods to go about on the calculations for both the instruments.
you have to understand first WHY do you actually use those instruments rather than a regular ruler. The simple and primary reason being they provide more accuracy. There are others as well - they can calculate the diameter accurately etc.
vernier callipers (vc) and micrometer gauge (mg) are NOT the same thing however the theoretical calculation is similar.
VC has a least count of 0.01 cm so it can calculate the diameter of an object to 3 sfg.
MG has an LC of 0.001 cm
^ These are standard least counts for instruments. This can vary too.
Google the rest please because theres a lot to learn and i cannot possibly type everything because i have to go study chemistry.
http://www.tutorvista.co.uk/content/physics/physics-i/measurement-and-experimentation/vernier-callipers-animation.php
http://www.tutorvista.co.uk/content/physics/physics-i/measurement-and-experimentation/screw-gauge.php
^ These should cover pretty much everything up including the calculation for LC and zero error.
--- End quote ---
oh so so sorry... i knew that thr use.. but i didn't get the calculation part :(
from where is .10, 4 and .01 coming :(
~ Miss Relina ~:
--- Quote from: Ari Ben Canaan on May 12, 2011, 02:17:17 pm ---Are you sure you understand what a zero error is ?
--- End quote ---
i got confuded from these question by book simply says read where the scales coincide then if it + add it to ur reading now still confused by what the previous question asked
elemis:
--- Quote from: Relina on May 12, 2011, 10:55:09 pm ---i got confuded from these question by book simply says read where the scales coincide then if it + add it to ur reading now still confused by what the previous question asked
--- End quote ---
Normally, when you close the jaws of a vernier calliper or those of a micrometer the scale MUST show a reading of zero.
That's because its obviously measuring nothing.
However, sometimes due to callibration errors or misuse of the equipment when you close the jaws the scale DOESN'T read zero.
Instead the scale will show some value. This value, when the jaws are closed, is the zero-error of your vernier calliper/micrometer.
If you use a vernier calliper with a zero error you must do the following :
measured length as per vernier MINUS zero error.
curiousguy:
can some one please answers these question of paper 1 2003,2004,2005 queation 39. And please explain me with detail how to find half life and its concept.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version