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Physics/Density Calculation

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Question
28.5 g of iron shot is added to a graduated cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL mark. From this information, calculate the density of iron.

Answer
Density is equal to mass divided by volume. In this case the volume of the iron shot will me equal to the change in volume of the water in the graduated cylinder:
V = 49.10-45.50 = 3.6 cm^3
Dividing the mass by the volume the density is:
Density = m/V = 28.5gm/3.6cm^3 = 7.92gm/cm^3

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James J. Kovalcin

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I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

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