Two bars,A and B,each of length 2.0 m and cross sectional area 1.0 m²,are placed end to end as shown in the figure.
The thermal conductivities of the bars are
k A = 439 J/(s × m × K)and k B = 887 J/(s × m × K),respectively.The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K.
-Which one of the following statements is true concerning the above situation?
A)For a given time t,the amount of heat transferred through bar A is the same as that through B.
B)For a given time t,the amount of heat transferred through bar A is smaller than that through B.
C)For a given time t,the amount of heat transferred through bar A is less than that through B.
D)The time for a quantity of heat Q to pass through bar A is less than that for B.
E)Time is not a factor in determining the quantity of heat conducted through these bars.

Question

Two bars,A and B,each of length 2.0 m and cross sectional area 1.0 m²,are placed end to end as shown in the figure.
 The thermal conductivities of the bars are
k A = 439 J/(s × m × K)and k B = 887 J/(s × m × K),respectively.The left end of bar A is maintained at 373 K while the right end of B is maintained at 273 K.
-Which one of the following statements is true concerning the above situation?
A)For a given time t,the amount of heat transferred through bar A is the same as that through B. 
B)For a given time t,the amount of heat transferred through bar A is smaller than that through B. 
C)For a given time t,the amount of heat transferred through bar A is less than that through B. 
D)The time for a quantity of heat Q to pass through bar A is less than that for B. 
E)Time is not a factor in determining the quantity of heat conducted through these bars.

Quizplus · Accepted Answer

For a given time t, the amount of heat transferred through bar A is the same as that through B because the thermal conductivity of both bars is the same, and the temperature difference between the ends of the bars is the same.

Two Bars,A and B,each of Length 2