What is the mass of this iceberg, given that the density of ice is 917 kg/m3?  kg (b) How much heat is required to melt it? The latent heat of fusion of ice is 79.8 kcal/kg or 334 kJ/kg.  J (c) Compare this amount of energy with the annual U.S. energy use of 8 ✕ 1019 J by taking a ratio. Eice EUS =   (d) How many years (365.25 days) would it take sunlight alone to melt ice this thick, if the ice absorbs an average of 145 W/m2, 10.50 h per day?

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In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 165 km long, 36.0 km wide, and 250 m thick.

(a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3?
 kg

(b) How much heat is required to melt it? The latent heat of fusion of ice is 79.8 kcal/kg or 334 kJ/kg.
 J

(c) Compare this amount of energy with the annual U.S. energy use of 8 ✕ 1019 J by taking a ratio.
Eice
EUS
 =
 

(d) How many years (365.25 days) would it take sunlight alone to melt ice this thick, if the ice absorbs an average of 145 W/m2, 10.50 h per day?
 yr
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