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please answer the pre lab questions
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LABORATORY 18 Archimedes' Principle
PRE LABORATORY ASSIGNMENT
1. What is the definition of density? What are its units?
2. What is specific gravity? What are its units?
3. State Archimedes' principle.
COPYRIGHT 2008 Thomson Brooks Cole
4. The buoyant force on an object placed in a liquid is (a) always equal to the volume of the liquid
displaced (b) always equal to the weight of the object (c) always equal to the weight of the liquid
displaced (d) always less than the volume of the liquid displaced.
5. An object that sinks in water displaces a volume of water (a) equal to the object's weight (b) equal to
the object's volume (c) less than the object's volume (d) greater than the object's weight.
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Physics Laboratory Manual Layd
6. An object that sinks in water has a mass in air of 0.0675 kg. Its apparent mass when submerged in
water, as in Figure 18-1, is 0.0424 kg. What is the specific gravity SG of the object? Considering
the densities given in Appendix II, of what material is the object probably made? Show your work.
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Physics Laboratory Manual Loyd
6. An object that sinks in water has a mass in air of 0.0675 kg. Its apparent mass when submerged in
water, as in Figure 18-1, is 0.0424kg. What is the specific gravity SG of the object? Considering
the densities given in Appendix II, of what material is the object probably made? Show your work
7. A piece of wood that floats on water has a mass of 0.0175 kg. A lead weight is tied to the wood, and
the apparent mass with the wood in air and the lead weight submerged in water is 0.0765 kg.
The apparent mass with both the wood and the lead weight both submerged in water is 0.0452 kg
What is the specific gravity of the wood? Show your work.
8. An object has a mass in air of 0.0832 kg, apparent mass in water of 0.0673 kg, and apparent mass
in another liquid of 0.0718 kg. What is the specific gravity of the other liquid? Show your work.
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Explanation & Answer
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Pre-Lab Questions:
1. Density is the mass of a substance per unit volume. It is a measure of how compact the
substance is. Since it is mass over volume:
𝑚𝑎𝑠𝑠
𝜌=
𝑣𝑜𝑙𝑢𝑚𝑒
The units are:
𝑔
𝑔
𝑖𝑛
𝐶𝐺𝑆
𝑠𝑦𝑠𝑡𝑒𝑚
=
;
𝑐𝑚3
𝑚𝐿
𝑘𝑔
𝑖𝑛 𝑆𝐼 𝑠𝑦𝑠𝑡𝑒𝑚𝑠
𝑚3
2. Specific gravity is the ratio of the density of ...
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