PHYSICS question, please help, step by step problem 1- Would we need to reduce o
ID: 1652714 • Letter: P
Question
PHYSICS question, please help, step by step problem
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
1. The default lengths of objects are defined at 20 C, so one when measures lengthts at a greater temperature, if the coefficient of thermal expansion of that object is +ve ( which is true for most of the substances out there) , the length measured at 30 degree is more, so we need to reduce the length measured at 30 C
2. For example, if melting point of ice was determined to be 2 C, 2C, 2C threee times, the readings are precide as they have 0 standard deviation, but they are incorrect though as melting point of ice is 0 C
3. length of pipe should be reported as , l = 40.0001 m [ as least count of the scale is 0.1 mm ,m so the last digit of the measure ment should correspond to 0.1 mm measurement, and the reading should not be more precise than this because that is not possible due to the limitation of the3 scale]
4. Average fopr the the given data = 182.4
deviationas in each measurement from the mean =
0
0.2
-0.1
-0.3
0
0
0.2
sum of deviations = 0
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