An iron casting containing a number of cavities weighs 2.359×104N in air and 1.901×104N in water....
An iron casting containing a number of cavities weighs 2.359×104N in air and 1.901×104N in water. What is the total volume of all the cavities in the casting? The density of iron (that is, a sample with no cavities) is 7.870 g/cm3.
Homework Answers
The weight of the iron casting in the air is
The mass of the iron casting is
The density of the iron is
The volume of the iron in the cast is
And the weight in the water is
The change in the weight is given by
The density of the water is
So, the volume of the cast is
So, the volume of the cavities in the cast is
Changing the units we get
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