# lecture16 - Physics 231 Lecture 16 Main points of todays...

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Main points of today’s lecture: Bernouli’s equation hysics 31 Lecture 6 q Physics 231 Lecture 16 2 2 1 gy v P f f f Viscous flow 0 2 0 0 2 1 gy v P Poisseuille’s law d Av F   L P P R t V 8 2 1 4

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Does the water level go up or down? – a) The water level goes up. ) The water level goes down. b) The water level goes down. – c) The water level goes neither up nor down.
Conceptual question A 200-ton ship enters the lock of a canal. The fit between the sides of the lock and the ship is tight so that the weight of the water left in the lock after it closes is much less than 200 tons. an the ship still float if the eight of the quantity f water left in Can the ship still float if the weight of the quantity of water left in the lock is much less than the ship’s weight? – a) Yes, as long as the water gets up to the ship’s waterline. – b) No, the ship touches bottom because it weighs more than the water in the lock. It doesn’t matter how deep is the ocean. A boat displaces ater until it comes up to the waterline and then it floats. wate u t tco esuptot ewate ea dt e t oats.

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Conceptual question A lead weight is fastened on top of a large solid piece of Styrofoam that floats in a container of water. Because of the weight of the lead, the water line is flush with the top surface of e Styrofoam If the piece of Styrofoam is turned upside down the Styrofoam. If the piece of Styrofoam is turned upside down so that the weight is now suspended underneath it, – a) the arrangement sinks. – b) the water line is below the top surface of the Styrofoam. – c) the water line is still flush with the top surface of the Styrofoam. Same displaced water in both figures!
Conceptual quiz A lead weight is fastened to a large solid piece of Styrofoam that floats in a container of water. Because of the weight of the lead, the water line is flush with the top surface of the Styrofoam. If

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lecture16 - Physics 231 Lecture 16 Main points of todays...

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