Buoyancy and Water Density Factors
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2 What effect does the temperature of the water have on the upthrust of the water on a ship?
3 How does the presence of salt in water affect the upthrust of the water on a ship?
4 What might happen to a ship that was loaded to the line in cold salt water (W) and then sailed into warm fresh water? Explain your answer.
This question includes visual content: The image shows a textbook page with several diagrams and photographs. 1) A free-body diagram of a person standing, showing vertical arrows for weight (down) and normal force (up). 2) A photo of an automatic weather station buoy floating in the ocean, paired with its force diagram showing weight and upthrust. 3) A close-up photograph of Plimsoll lines (loading marks) on the side of a red-painted ship hull. The marks include letters like TF (Tropical Fresh Water), F (Fresh Water), T (Tropical seawater), S (Summer seawater), W (Winter seawater), and WNA (Winter North Atlantic).
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In this exercise, we will explore how volume and upthrust change when a ship moves between different types of water. Let's look at questions two, three, and four from the textbook.
Floating Objects and Upthrust
Question two asks: what effect does the temperature of the water have on the upthrust of the water on a ship?
Question 2: Effect of Temperature
To answer this, we must remember that upthrust depends on fluid density. Warmer water is generally less dense than colder water because the molecules are more spread out.
For a ship with a constant weight, the upthrust must remain equal to that weight to stay afloat. However, because warmer water is less dense, the ship must displace a larger volume of it to maintain that same upthrust.
So, temperature affects the density, which in turn affects how much of the ship is submerged. In warmer water, the ship sits lower.
Question three asks: how does the presence of salt in water affect the upthrust on a ship?
Question 3: Effect of Salt (Salinity)
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