Physics quiz question: significant figures multiplication/division rule

Physics 205A Quiz 1, fall semester 2012
Cuesta College, San Luis Obispo, CA

Cf. Giambattista/Richardson/Richardson, Physics, 2/e, Problem 1.19, Comprehensive Problem 1.57(d)

Evaluate the following calculation, using an appropriate number of significant figures and/or decimal places.

      68 m ÷ 7.3 s = ?

(A) 9 m/s.
(B) 9.3 m/s.
(C) 9.32 m/s.
(D) 9.315 m/s.

Correct answer (highlight to unhide): (B)

Both 68 m and 7.3 s have two significant figures (as denoted by the digits in green). The result of this division must also have two significant figures.

Sections 70854, 70855
Exam code: quiz01bL0t
(A) : 0 students
(B) : 61 students
(C) : 0 students
(D) : 0 students

Success level: 100%
Discrimination index (Aubrecht & Aubrecht, 1983): 0