Multiple Choice
Why can some insects walk on water?
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19. Fluid Mechanics
Buoyancy & Buoyant Force
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Which of the following statements best explains why ice floats on water?
A
Ice is less dense than water, causing it to float.
B
Ice has a higher surface tension than water, allowing it to float.
C
Ice is lighter than water due to its lower molecular weight.
D
Ice displaces more water than its own weight, making it buoyant.
Verified step by step guidance1
Understand the concept of density: Density is defined as mass per unit volume. It is a measure of how much matter is packed into a given space.
Recognize the unique property of water: Water is one of the few substances that expands when it freezes. This expansion means that the same mass of water occupies a larger volume as ice than as liquid water.
Apply the concept of density to ice and water: Since ice occupies more volume than the same mass of liquid water, its density is lower. This is because density is inversely proportional to volume when mass is constant.
Relate density to buoyancy: An object will float in a fluid if it is less dense than the fluid. Since ice is less dense than liquid water, it will float.
Conclude with the correct explanation: The statement 'Ice is less dense than water, causing it to float' best explains why ice floats on water.
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