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CHE 254 — Assignment 2 — 090819 2.16 Perform the following calculations. In each case, first estimate the solution without using a calculator, following the procedure outlined in Section 2.5b, and then do the calculation, paying attention to significant figures. (a) 2.78.632 (b) 3.600⋅10−4 /45 (c) 2.365125.2 (d) 4.753⋅10 4−9⋅10 2
CHE 254
Assignment 2 — due 8/26/09 Tom Bertalan, James Clark, Craig Jackson, Rohit Deshane
Tonya Klein
Page 2 of 3
2.17 The following expression has occurred in a problem solution: .6700264,98065.386⋅104 R= 7 3.141590.479⋅10 The factor 6 is a pure interger. Estimate the value of R without using a calculator, following the procedure outlined in Section 2.5b. Then calculate R, expressing your answer in both scientific and decimal notation and making sure it has the correct number of significant figures.
CHE 254
Assignment 2 — due 8/26/09 Tom Bertalan, James Clark, Craig Jackson, Rohit Deshane
Tonya Klein
Page 3 of 3
2.18 Two thermocouples (temperature measurement devices) are tested by inserting their probes in boiling water, recording the readings, removing and drying the probes, and then doing it again. The results of five measurements are as follows: T(*C)—Thermocouple A 72.4 73.1 72.6 72.8 73 T(*C)—Thermocouple B 97.3 101.4 98.7 103.1 100.4 (a) For each set of temperature readings, calculate the sample mean, the range, and the sample standard deviation. (b) Which thermocouple readings exhibit the higher degree of scatter? Which thermocouple is more accurate?
CHE 254
Assignment 2 — due 8/26/09 Tom Bertalan, James Clark, Craig Jackson, Rohit Deshane
Tonya Klein
CHE 254 — Assignment 2 — 090819 2.16 Perform the following calculations. In each case, first estimate the solution without using a calculator, following the procedure outlined in Section 2.5b, and then do the calculation, paying attention to significant figures. (a) 2.78.632 (b) 3.600⋅10−4 /45 (c) 2.365125.2 (d) 4.753⋅10 4−9⋅10 2
CHE 254
Assignment 2 — due 8/26/09 Tom Bertalan, James Clark, Craig Jackson, Rohit Deshane
Tonya Klein
Page 2 of 3
2.17 The following expression has occurred in a problem solution: .6700264,98065.386⋅104 R= 7 3.141590.479⋅10 The factor 6 is a pure interger. Estimate the value of R without using a calculator, following the procedure outlined in Section 2.5b. Then calculate R, expressing your answer in both scientific and decimal notation and making sure it has the correct number of significant figures.
CHE 254
Assignment 2 — due 8/26/09 Tom Bertalan, James Clark, Craig Jackson, Rohit Deshane
Tonya Klein
Page 3 of 3
2.18 Two thermocouples (temperature measurement devices) are tested by inserting their probes in boiling water, recording the readings, removing and drying the probes, and then doing it again. The results of five measurements are as follows: T(*C)—Thermocouple A 72.4 73.1 72.6 72.8 73 T(*C)—Thermocouple B 97.3 101.4 98.7 103.1 100.4 (a) For each set of temperature readings, calculate the sample mean, the range, and the sample standard deviation. (b) Which thermocouple readings exhibit the higher degree of scatter? Which thermocouple is more accurate?
CHE 254
Assignment 2 — due 8/26/09 Tom Bertalan, James Clark, Craig Jackson, Rohit Deshane
Tonya Klein
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