A Heat-Conducting Rod That Is Wrapped in Insulation Is Constructed

question 64

Multiple Choice

A heat-conducting rod that is wrapped in insulation is constructed with a 0.15-m length of alloy A and a 0.40-m length of alloy B,joined end-to-end.Both pieces have cross-sectional areas of 0.0020 m².The thermal conductivity of alloy B is known to be 1.8 times as great as that for alloy A.The end of the rod in alloy A is maintained at a temperature of 10°C,and the other end of the rod is maintained at an unknown temperature.When steady state flow has been established,the temperature at the junction of the alloys is measured to be 40° C,and the rate of heat flow in the rod is measured at 56 W.What is the thermal conductivity of alloy A?

• A)120 W/m ∙ K
• B)125 W/m ∙ K
• C)130 W/m ∙ K
• D)135 W/m ∙ K
• E)140 W/m ∙ K

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Definitions:

Demand Curve

A graph showing the relationship between the price of a good or service and the quantity of it that consumers are willing to purchase at various prices.

Future Price Decline

The expectation that the price of goods or services will decrease in the future, often influencing consumer and business decisions.

Leftward Shift

In economic terms, a movement of the supply or demand curve to the left on a graph, indicating a decrease in supply or demand.

Demand Curve

A demand curve is a graphical representation that shows the relationship between the price of a good or service and the quantity of it that consumers are willing to purchase at various prices.