Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube.By what factor is the rate of heat flow changed when the bar's cross-sectional area is tripled?
A) 0.33
B) 1/9
C) 3.0
D) 9.0

Question

Quizplus · Accepted Answer

The rate of heat flow is directly proportional to the cross-sectional area of the bar. Therefore, if the cross-sectional area is tripled, the rate of heat flow will also be tripled. So, the factor by which the rate of heat flow changes is 3.0. Hence, the answer is (C).

Carly Places One End of a Steel Bar in a Bunsen