Ph191 Quiz #1

October 8, 2004 Name: ______________________Instructor: Patricia Wrean

Total: 40 points

1. State the number of significant figures in the following. (5 points)

a) 45 030 _________________

b) 1.20 10-10 _________________

c) 0.0030 _________________

d) 9.50 _________________

e) 20 _________________

2. Calculate with the correct number of significant figures. (5 points)

a) (2.98 10-3)3 _________________

b) 3 952 cm 120.57 cm + 7.8 102 cm _________________

c) (0.273 m/s + 1.0 m/s) / 7.035 s _________________

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3. Convert the following quantities into SI base or derived units. Show work for partialcredit. (8 points)

a) 3.48 m/s2 _________________

b) 24 ng _________________

c) 0.78 feet/week _________________

d) 18.76 lb _________________

4. Calculate the following, determining the appropriate uncertainty. Be sure to roundoff your answer to the appropriate number of sigfigs. (7 points)

a) (4.5 cm 20 %) (1.38 0.03 cm) _________________

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b) 2(4.5 cm 20%) + 3(0.20 0.06 cm) _________________

c) (0.20 0.06 cm)2 + (4.5 cm 20 %) (1.38 0.03 cm) _________________

5. The accepted value for the acceleration due to gravity in Victoria, BC, is 9.81 m/s2.Two students perform an experiment in Ph191 to try to confirm this value. Nancygets a value of 9.78 0.02 m/s2, while Wilfs measurement is 9.85 m/s2 0.6%.Compare each students result to the accepted value to find out if they are inagreement. (Remember the concluding statement!) (5 points)

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6. In order to make the perfect cup of coffee, 0.250 L 1% of coffee is poured into amug. Then 18 2 mL of cream is added. Unfortunately, while the cream is stirredin, 3.5 mL 10% of the coffee spills over the side. Calculate the total volume ofcoffee after the spill, and state your answer in SI base or derived units. (Be sure toround your answer to the correct number of sigfigs, and dont forget your concludingstatement!) (5 points)

7. The volume of water inside a water balloon has a radius of 6.7 0.5 cm. Supposethis water is poured into a container such that the resulting volume of water is in theshape of a cube. What is the length of the side of the cube? (Same hints as aboveproblem.) (5 points)

Ph191 Quiz #1October 8, 2004Name: ______________________Instructor: Patricia Wrean