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donjt81
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A steel tape measure gives the length of a brass rod 102cm when both are at 12 degree C. What would the tape measure read (d) when the temperature increases to 45 degree C?
coeff of linear expansion of steel = 1.9 * 10 power -5
coeff of linear expansion of brass = 1.1 * 10 power -5
so this is my approach
deformation = coeff * change in temp * length
for the steel tape I get
deformation = 1.9 * 10 power -5 * (45-12) * 102
=.063954
for the brass rod i get
deformation = 1.1 * 10 power -5 * (45-12) * 102
=.037026
So now my question is
What would the tape measure read (d) when the temperature increases to 45 degree C?
the tape measure would read 102 + .063954 = 102.063954 (is this correct?)
then why would they give coess for brass rod. seems like i could have gotten this answer without that also.
please help
thanks in advance
coeff of linear expansion of steel = 1.9 * 10 power -5
coeff of linear expansion of brass = 1.1 * 10 power -5
so this is my approach
deformation = coeff * change in temp * length
for the steel tape I get
deformation = 1.9 * 10 power -5 * (45-12) * 102
=.063954
for the brass rod i get
deformation = 1.1 * 10 power -5 * (45-12) * 102
=.037026
So now my question is
What would the tape measure read (d) when the temperature increases to 45 degree C?
the tape measure would read 102 + .063954 = 102.063954 (is this correct?)
then why would they give coess for brass rod. seems like i could have gotten this answer without that also.
please help
thanks in advance