help filling in the blanks of the chart Vaughn College Ka Coefficient of linear
ID: 1582138 • Letter: H
Question
help filling in the blanks of the chart
Vaughn College Ka Coefficient of linear expansion Name - orig. length) (AT) material 1 material 2 material orig. temp (C) orig. length () final temp (C) 2 6 NcH)3522%.449 9 b 95 change in length 037 experimental coeff of exp. standard coeff. of exp. % error Questions: 1) When the rod is heated, does it diameter increase? 2) After the heated rod returns to room temperature, will it return to its original length ? 3) It is unlikely that you found a zero % error. Briefly discuss some possible error sources? 4) Do all metals have the same coefficient of expansion? 5) What is the temperature of the steam used in this experiment?Explanation / Answer
aluminum:
Original temperatrure = 20oC
Final temperature = 96oC
original length = 26.352 in
change in length = 0.037 in
Strain = 0.037/26.352=0.0014
change in temperature= 96-20=76oC
coefficient of thermal expansion = 0.0014/76=1.847*10-5 /oC
standard coefficne tof thermal expansion of aluminum = 2.36*10-5 /oC
% error= (2.36-1.847)/2.36 * 100 = 21.7%
iron:
Original temperatrure = 20oC
Final temperature = 95oC
original length = 26.449 in
change in length = 0.019 in
Strain = 0.019/26.449=7.18*10-4
change in temperature= 95-20=75oC
coefficient of thermal expansion = 7.18*10-4/75=9.578*10-6 /oC
standard coefficne tof thermal expansion of iron = 11.7*10-6 /oC
% error= (11.7-9.578)/11.7 * 100 = 18.14%
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