I Place a 600-G Ice Cube (Initially at 0°C)in a Styrofoam

question 38

Multiple Choice

I place a 600-g ice cube (initially at 0°C) in a Styrofoam box with wall thickness 1.8 cm and total surface area 700 cm².If the air surrounding the box is at 25°C and after 6 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)

• A) 7.2 × 10−⁵ cal/s⋅cm⋅°C
• B) 2.7 × 10−⁶ cal/s⋅cm⋅°C
• C) 1.7 × 10−² cal/s⋅cm⋅°C
• D) 2.4 × 10−⁴ cal/s⋅cm⋅°C
• E) 9.4 × 10−⁴ cal/s⋅cm⋅°C

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Definitions:

Materials Costs

The cost of raw materials and components that are used in the production of goods or services.

Processing Costs

Expenses related to the operations required to transform raw materials into finished products.

Split-off Point

In process costing, the stage in the manufacturing process where joint products can be physically separated and identified as individual products.

Joint Process

A production process in which multiple products are produced simultaneously from the same raw materials or input.