Q1 ethyl alcohol has a specific gravity of 0.8. If a cork of specific gravity 0.25 floats in a beaker of ethyl alcohol , what fraction of the cork's volume is submerged?

CAT PHYSICS AND MATH REVIEW Curious Because the cork has a lower density than the ethyl alcohol, we know that the cork will float. justhermore, the fraction of the cork's volume that will be submerged is sub _ Pobject (0.25 ) PH,0 0.25 4 5 V Pfluid (0.8) PHO 0.8 4 16 Therefore, the answer is D. Example 8-8: The density of ice is 920 kg/m, and the density of seawater is 1,025 kg/m . Approxi- mutely what percent of an iceberg floats above the surface of the ocean (in other words, how much is "the tip of the iceberg")? the same 59% rged and B / 10% 90% 95% fect is ling Solution: Because the ice has a lower density than the seawater, we know that the iceberg will float. Fur- seamore, the fraction of the iceberg's volume that will be submerged is Vsub _ Pobject 920 8 900 V = 90% the bug Pfluid 1025 kg 1000 the bon However, the answer is not C. The question asked what percent of the iceberg floats above the surface. So 190% is submerged, then 10% is above the su ading it is a common MCAT tactic. he surface, and the answer is B. Watch for this kind of tricky Example 8-9: A glass sphere of specific gravity 2.5 and volume 10- me is completely submerged in a container of water. What is the ight of the sphere while immersed? object's