A Solid Concrete Wall Has Dimensions 4

question 35

Multiple Choice

A solid concrete wall has dimensions 4.0 m × 2.4 m and is 30 cm thick.The thermal conductivity of the concrete is 1.3 W/m ∙ K,and it separates a basement from the ground outside.The inner surface of the wall is at 18°C,and the outside surface is at 6°C.How much thermal energy flows through the wall every hour?

• A)1.8 MJ
• B)1.8 kJ
• C)500 J
• D)5.0 MJ
• E)5.0 kJ

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Definitions:

Duplicated Chromosome

A chromosome that has undergone replication resulting in two identical copies joined together, important for cell division.

Chromatid

A chromatid is one of two identical halves of a replicated chromosome, which are joined at their centromeres, before being separated during cell division.

Early Prophase

The initial phase of mitosis or meiosis when chromosomes begin to condense and the nuclear envelope starts to break down.

Metaphase

Stage of mitosis at which all chromosomes are aligned midway between spindle poles.