Buoyancy and Floating Objects: Quiz Preparation for Phys171 - Prof. Wolfgang Losert, Study notes of Physics

Download Buoyancy and Floating Objects: Quiz Preparation for Phys171 - Prof. Wolfgang Losert and more Study notes Physics in PDF only on Docsity! 1 Phys171 – Mon 4/30 • Quiz • This week: Ch 15 and 36 • Last week: Ch 36 plus review • Office hours until 11.40am today in rm 3359 AV Williams • Mon May 14 rm ??? 5-6.30pm • Wed May 16 10am-noon Buoyancy Place wood sphere in place of fluid sphere (i.e. wood sphere in water) Take away surrounding fluid, wood will fall down Fg = - ρWoodVg Surrounding fluid still exerts upward buoyancy force B = ρfluidVg Net force on wood: F=ρfluidVg – ρWoodVg = (ρfluid– ρWood)Vg 2 Buoyancy in partially submerged bodies Vice is the total volume of the ice Vwater is the volume of the water displaced – Equal to the volume of the submerged fraction of the iceberg (89% of the ice is below water) Vwater=0.89*Vice Buoyancy force: ρwaterVwaterg = Weight of iceberg: ρiceViceg ρwaterVwaterg = ρiceViceg ρwater**0.89*Vice = ρiceVice ρwater*0.89 = ρice A boat carrying a large boulder is floating on a lake.The boulder is thrown overboard and sinks. The water level in the lake (with respect to the shore) 1. rises. 2. drops. 3. remains the same.