I Place a 250-G Ice Cube (Initially at 0°C)in a Styrofoam

question 54

Multiple Choice

I place a 250-g ice cube (initially at 0°C) in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm².If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)

• A) 9.6 × 10−⁵
• B) 2.8 × 10−⁶
• C) 1.15 × 10−²
• D) 2.3 × 10−⁴

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Definitions:

SAT Mathematics

A standardized test section evaluating mathematical reasoning and problem-solving skills, part of the SAT exam for college admissions in the United States.

Confidence Interval

A statistical range, computed from sample data, believed to encompass the actual value of a population parameter.

Normal Distributed

A statistical distribution where observations are equally distributed around the mean, creating a bell-shaped curve.

Significance Level

The threshold below which a p-value is considered statistically significant, typically set at 0.05 or 5%.