What is the approximate density of water, in SI Units?

1. 10⁻⁵ kg/m³
2. 0.01 kg/m³
3. 0.1 kg/m³
4. 1 kg/m³
5. 1000 kg/m³

Question 1.1

Here were Harlow’s measurements of t₅:

7.53 s

7.38 s

7.47 s

7.43 s

Knowing all of this, which of the following might be a good estimate for the uncertainty in Harlow’s first measurement of 7.53 seconds?

1. 0.005 s
2. 0.05 s
3. 0.5 s
4. 5 s
5. Impossible to determine

Question 1.2

• You wish to know the time it takes to travel from Finch station to Yonge/Bloor by subway. You ask 10 people to take a stopwatch and time the trip. After analyzing all the data you find that it takes an average of 26 minutes and 40 seconds, with an uncertainty in this average of ± 100 seconds.
• If you expand your survey and ask 1000 people to time the trip, when you analyze the data, what would you expect to be the uncertainty in the average time?
• 100 seconds
• 50 seconds
• 10 seconds
• 1 second
• 0.05 seconds

Question 1.3

• If a calculated result is d = 7.056 +/- 0.705 m, how should you report this?

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1. 7.1 ± 0.7 m
2. 7.06 ± 0.71 m
3. 7.056 ± 0.705 m
4. Any of the above
5. Either A or B, but not C

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Question 1.4