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lecture26_09

# lecture26_09 - Announcements 1 HW10 due April 15 2 Midterm2...

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Announcements 1. HW10 due April 15 2. Midterm2: exam and solution posted in course website if you want to look at your scantron, see Prof. Reitze before end of Tuesday If you forgot to bring ID during exam, you must see Prof. Reitze with your ID or your exam will not be graded. 3. Final exam: April 25, 10 am to noon roughly ½ of questions on topics covered in midterms, the rest on Chapters 9, 13, 14 Buoyant Force The magnitude of the buoyant force always equals the weight of the displaced fluid The buoyant force equation is the same for a totally submerged object of any size, shape, or density fluid fluid fluid B V g w ρ = = fluid fluid fluid B V g w ρ = = Totally Submerged Object mg = ρ object V object g For completely submerged object: V object = V fluid displaced If ρ object < ρ fluid , mg < B If ρ object > ρ fluid , mg > B Floating Object If ρ object < ρ fluid , mg < B when object is fully submerged F net = B - F g > 0 Object rises Floating Object The forces balance obj fluid fluid obj V V = ρ ρ V object = V

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