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Which of the following statements about floating objects is always true? a. The object’s density is greater than the density of the fluid on which it floats. b. The object’s density is equal to the density of the fluid on which it floats. c. The displaced volume of fluid is greater than the volume of the object. d. The buoyant force equals the weight of the object.
d. By process of elimination. a is never true, b can be true, c is not true (volume displaced is equal to the volume of the object, or less, never more). Also d is true!, the buoyant force must balance the weight, or the weight would sink. If the buoyant force was greater the mass would fly up off the water. So the forces are balanced -Dylan
I think this is about Archimedes' principle. There's a good page about it here: http://en.wikipedia.org/wiki/Archimedes_principle You should get the correct answer easily once you look at this page. Best wishes,