A Camper Carries Her Drinks in an Ice Chest Made

question 91

Multiple Choice

A camper carries her drinks in an ice chest made of styrofoam. The chest is 40 cm × 45 cm × 70 cm, and the walls and lid are 2.5 cm thick. The contents of the chest are ice, water, cans of soft drinks, and other food, all of which are in thermal equilibrium with the ice water. The temperature just outside the ice chest is 35°C. What is the rate of heat flow through the walls of the box? The thermal conductivity of styrofoam is 0.010 W/(m·K) .

• A) 14 W
• B) 16 W
• C) 18 W
• D) 20 W
• E) 22 W

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Definitions:

Assembling

The process of combining components or elements to form a complete item or system.

Unit-level Activity

Activities that are performed each time a unit is produced, directly associated with the production of units.

Manufacturing Overhead Costs

Expenses related to the production process that are not directly tied to the product, such as rent, utilities, and salaries of managers.

Activity-based Costing

A costing method that identifies activities in an organization and assigns the cost of each activity to all products and services according to the actual consumption by each.