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Thermal Expansion of brass rod

  • Thread starter lackos
  • Start date
  • #1
38
0

Homework Statement


A student measures the length of a brass rod with a steel tape at 20.0°C. The reading is 80.00 cm. What will the tape indicate for the length of the rod when the rod and the tape are at each of the following temperatures?
a) -18.0°C



Homework Equations


(delta)L=a*L*(delta)T.where a for brass is 19e-6, and steel is 11e-6


The Attempt at a Solution


i sarted by finding the change in the increment of a cm on the steel tape using the the above equation and then finding the expansion for a cm of brass at the temperature. multipplied it by the original measurement, then added the resulting value to the measuremnt. however im not sure if this is right
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31
Yes that would be correct. Just make sure your value for ΔL is negative, since your change in temperature is negative.
 

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