1- Would we need to reduce or increase the lengths measured at 30C ?? Explain. 2

Question

1- Would we need to reduce or increase the lengths measured at 30C ?? Explain.

2- Suppose you measure the melting point of ice three times. Give an example of results that would be precise but inaccurate.

3- A pipe is measured once with a steel tape with markings every .1mm.The two ends of the pipe line up with the 0 and 40-m marks on the tape. How should this datum be recorded using the appropriate number of significant figures?

4- You measure the length of the table to be 182.4, 182.2, 182.5, 182.7, 182.4, 182.4, and 182.2 cm. What is the average length of the table?? What are the deviations in each of the measurements?? Add the deviations and show that you get zero.

Explanation / Answer

The standard length is fixed at room temperature standard, which is 25C, at 30C the lenght scale would be elongated hence we will be measureing more length then actual, hence we need to decrease the length.

2. An example would be 2C,1.99999C,2.0000001C . This is precise by inaccurate as the actual temp is 0C

3. It should be recoreded as 40+- .0002 m, as both ends will count to the error

4. Avg is 182.4, deviations respectively will be 0,-.2,.1,.3,0,0,-.2 which sums upto zero

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