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# lecture24_post - Fluids statics and dynamics In class...

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Fluids: statics and dynamics

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Suppose superman has infinite strength. How high can he suck the liquid up? (density of liquid is ) 1. h = infinity 2. h = 9.8 m 3. h = P 0 / g In class Quiz #25-5 Question from class: Why can trees grow higher than 10 m?
http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_61/iss_1/76_1.shtml Why can trees grow higher than 10 m? Redwood in CA Capillary force Effective pore diameter inside leaves is 5-10 nm (spacing between cellulose microfibrils) Height of capillary water column with 10nm diameter is 3 km! Why aren’t trees taller? (electrostatic attraction of water to glass) A: friction, bubbles

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Last time: Buoyant Force (will it float?) The magnitude of the buoyant force always equals the weight of the displaced fluid The buoyant force is the same for a totally submerged object of any size, shape, or density fluid fluid fluid BV g w  ( remember V fluid means volume of fluid displaced by object )
Floating Object The forces balance obj fluid fluid obj V V

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lecture24_post - Fluids statics and dynamics In class...

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