One Kilogram of Chilled Water at 32°F (0°C) Is Placed

question 36

Multiple Choice

One kilogram of chilled water at 32°F (0°C) is placed in a freezer which is kept at 0°F (−18°C) . Approximately how much electric energy (in kilocalories) is needed to operate the compressor to cool this water to 0°F if the room temperature is maintained at 75°F (24°C) ? (LF,ice = 3.33 × 10⁵ J/kg; cice = 2.09 × 10³ J/kg⋅°C)

• A)13
• B)1.5
• C)15
• D)16
• E)33

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Indicates earning levels that are significantly lower than the average or median income in a given region or society.

Labor Productivity

A measure of economic performance that calculates the output per unit of labor input, such as output per hour worked.

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