- #1
leena19
- 186
- 0
Homework Statement
Two metre rulers made of metal of linear expansivity 25*10-6/degrees C are calibrated at 0 deg celsius.
One end of each of the metre rulers is fixed to a vertical wall and held side by side horizontally.
One of the meter rulers is maintained at 0 deg.C and the other at 100 deg C,which two scale markings coincide with each other ?
(ans: 40 & 40.1cm)
Homework Equations
l = l0 (1+ alpha*theta)
The Attempt at a Solution
For the metre ruler kept at 100deg.C ,
l = l0 (1+ alpha*theta)
l = 1 (1 + 25*10-6 *100)
l = 1.0025 mm
So when the meter ruler at 100 deg C reads 1mm,the actual reading is 1.0025mm.
I'm not sure if what I've found is relevant to this question,even if it is I don't know how to proceed from here.
Hope someone can help.
Thanx.