Using Physics to explain the motion of Olympic Divers

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The discussion centers on the physics of Olympic divers and the time it takes for them to reach the water surface. It highlights the assumption that divers jump with the same vertical speed, prompting questions about how to define that speed. Participants debate whether vertical speed should be measured from the head, feet, or another reference point. Understanding these factors is crucial for accurately explaining the motion of divers. The conversation emphasizes the importance of physics principles in analyzing diving techniques.
greedygnome
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Homework Statement
How does physics explain diving in Olympics? Assume that a diver performs 3 different jumps, at same initial speed from a platform of 10 m. (straight into water, one spin, two spins). What is the time difference in reaching the water surface?
Relevant Equations
Kinematic, Angular, Momentum
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I have a feeling that they will reach the water surface in the same time. How do I explain this in physics?
 
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Are you assuming the diver jumps up from the board with the same vertical speed in each case?

How would you define the vertical speed of a diver? Hint: speed of head, feet or something else?
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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