Chapter 17, Problem 111E

(a)

To determine

The reason why freezing does not occur throughout the entire volume of the lake.

(b)

To determine

To show: The thickness of the ice sheet formed at the surface is proportional to the square root of the time if the heat of fusion of the water freezing on the underside of the ice sheet is conducted through the sheet.

(c)

To determine

The time taken to form an ice sheet $25\text{cm}$ thick.

(d)

To determine

The time taken to freeze all of the water in lake if the lake is $40\text{m}$ deep.