A Sphere of Surface Area $1.25 \mathrm {~m} ^ { 2 }$

question 54

Multiple Choice

A sphere of surface area $1.25 \mathrm {~m} ^ { 2 }$ and emissivity 1.0 is at a temperature of $100 ^ { \circ } \mathrm { C }$ At what rate does it radiate heat into empty space? $\left( \sigma = 5.67 \times 10 ^ { - 8 } \mathrm {~W} / \mathrm { m } ^ { 2 } \cdot \mathrm { K } ^ { 4 } \right)$

• A) 7.1 W
• B) 0.71 mW
• C) 3.7 W
• D) 9.9 mW
• E) 1.4 kW

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Definitions:

Army Alpha

A group-administered intelligence test developed for the U.S. Army during World War I to assess recruit literacy and mental ability.

Army Beta

A nonverbal intelligence test developed for illiterate, non-English speaking, or verbally handicapped recruits in the U.S. Army.

World War I

A global conflict that took place primarily in Europe from 1914 to 1918, involving many of the world's great powers.

Data Collection

is the process of gathering and measuring information on variables of interest, in an established systematic fashion that enables one to answer stated research questions, test hypotheses, and evaluate outcomes.