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Concept explainers
(a)
The percentage of uncertainty of a hand-timed measurement of
(a)
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Answer to Problem 7P
Solution:4%
Explanation of Solution
Given:
Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 s due to human reaction time atthe start and stop moments.
Formula used:
Here, the formula used is
Calculation:
Conclusion:
Percent uncertainty of a hand-timed measurement of 5.5 s is almost 4%.
(b)
The percentage of uncertainty of a hand-timed measurement of 55 s.
(b)
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Answer to Problem 7P
Solution:0.4%
Explanation of Solution
Given:
Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 s due to human reaction time at the start and stop moments.
Formula used:
Here, the formula used is
Calculation:
Conclusion: Percent uncertainty of a hand-timed measurement of 55 s is almost 0.4%.
(c)
The percentof uncertainty of a hand-timed measurement of 5.5 min.
(c)
![Check Mark](/static/check-mark.png)
Answer to Problem 7P
Solution:0.1%
Explanation of Solution
Given:
Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 s due to human reaction time atthe start and stop moments.
Formula used:
Here, the formula used is −
Calculation:
Conclusion:Percentof uncertainty of a hand-timed measurement of 5.5 min is almost 0.1%.
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