Two Kilograms of Ice at 0

question 2

Multiple Choice

Two kilograms of ice at 0.0 °C are placed in a sealed glass container [k = 0.80 W/(m · C°) ].The container is then placed in a room that is maintained at 30.0 °C.The top cover is a thermal insulator and all other sides of the container are exposed to room air.The surface area of the container is 6.53 × 10^-² m²;and its glass walls are 0.0050 m thick.
-Approximately,how long does it take all of the ice to melt?

• A)4.7 min
• B)7.8 min
• C)18 min
• D)36 min
• E)2.7 h

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Definitions:

Confounding Variable

A variable that influences both the dependent and independent variables in a study, potentially misleading the results if not controlled.

Independent Variable

The variable in an experiment that is manipulated to observe its effect on a dependent variable.

Internal Validity

The extent to which a study can demonstrate a cause-and-effect relationship between variables, free from external influence.

Random Assignment

A process used in experimental designs to assign subjects randomly to either the treatment group or the control group, ensuring that each participant has an equal chance of being placed in any group.