Icebergs consist of freshwater ice and float in the ocean with only about 10.8 %

Question

Icebergs consist of freshwater ice and float in the ocean with only about 10.8 % of their volume above water (the "tip of the iceberg," so to speak). This percentage can vary, depending on the condition of the ice. Assume that the ice has the density 0.92×103kg/m3, although, in reality, this can vary considerably, depending on the condition of the ice and the amount of impurities in it.

Part A

What does this 10.8 % tell us is the density of seawater?

Express your answer using four significant figures.

Part B

What percentage of the icebergs' volume would be above water if they were floating in a large freshwater lake such as Lake Superior?

Explanation / Answer

The ice density is 920kg/m^3.

It tells us the density of the water is 11% greater than that of the ice.

(10.8% of 920) + 920 = water density of 1019.36kg/m^3

b)

1 cubic metre of ice has a volume of 10000 litres and a weight of 9200 kg It displaces 9,200 litres of fresh water to

float. It has (10000 - 9200)/10000 * 100 or 8% out of the water.

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