Physics 8A Quiz 1, Fall Semester 2005
Cuesta College, San Luis Obispo, CA
Physics 8A learning goal Q1.1
(Cf. Young and Freeman, University Physics, 11/e, Exercise 1.6.)
[3.0 points.] Suppose that you drank a Mountain Dew AMP(TM) beverage (containing 113 mg of caffeine) twice a day. Which one of the following choices best describes your average intake of caffeine in grams per second, if you do not drink any other caffeinated beverage?
(A) 2.62 x 10^-6 g/s.
(B) 5.12 x 10^-5 g/s.
(C) 1.95 x 10^-4 g/s.
(D) 0.382 g/s.
Correct answer: (A)
The intake in grams per second can be determined from converting the units from the given rate of 226 mg per day:
(226 g/1 day) * (1 g/1,000 mg) * (1 day/24 h) * (1 h/3600 s).
Response (B) is the result of 1,000/(226*3600*24); response (C) is 226*3,600*24/1000, but with the resulting 10^4 exponent switched to 10^-4; while response (D) is 3,600*24/(226*1,000).
Student responses:
(A) : 31 students
(B) : 3 students
(C) : 5 students
(D) : 0 students
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