A Heat-Conducting Rod That Is Wrapped in Insulation Is Constructed $m ^ { 2 }$

question 53

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 $m ^ { 2 }$ 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 $10 ^ { \circ } \mathrm { C }$ 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 $40 ^ { \circ } \mathrm { C }$ and the rate of heat flow in the rod is measured at 56 W. What is the thermal conductivity of alloy A?

• A) \(130 \mathrm {~W} / \mathrm { m } \cdot \mathrm { K }\)
• B) \(140 \mathrm {~W} / \mathrm { m } \cdot \mathrm { K }\)
• C) \(120 \mathrm {~W} / \mathrm { m } \cdot \mathrm { K }\)
• D) \(135 \mathrm {~W} / \mathrm { m } \cdot \mathrm { K }\)
• E) \(125 \mathrm {~W} / \mathrm { m } \cdot \mathrm { K }\)

---

Definitions:

Self-Regulation

The ability of an individual to manage their thoughts, emotions, and behaviors towards achieving long-term goals.

Self-Efficacy

An individual's belief in their own ability to succeed in specific situations or accomplish a task, which plays a significant role in how goals, tasks, and challenges are approached.

Rogerian Therapist

A therapist who practices Carl Rogers' client-centered therapy, focusing on unconditional positive regard, empathy, and congruence in the therapeutic relationship.

Perceived Self

How individuals view themselves, encompassing self-awareness and self-image, which may or may not align with reality or others' perceptions.