Two Bars,A and B,each of Length 2

question 14

Multiple Choice

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.

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Definitions:

Carbohydrate

A class of organic compounds consisting of carbon, hydrogen, and oxygen, primarily used by the body for energy and structural purposes.

Lipid

Lipids are a broad group of naturally occurring molecules that include fats, oils, waxes, and certain vitamins, characterized by their insolubility in water but solubility in organic solvents.

Nucleic Acid

Macromolecules, such as DNA or RNA, composed of nucleotides that carry genetic information or are involved in controlling cellular processes.

Protein

Large biomolecules consisting of one or more long chains of amino acids, essential for structure, function, and regulation of the body's cells, tissues, and organs.