2. A bowling ball has a density of 3500 kg/m and an apparent weight of 60 N when half-submerged in water. What is the actual weight of the ball in Newtons? Use g = 10 m/s 2) ball = 3500 kg/m ; Fw- FB = 60 (Vsub = 1/2 "ball) = 60+ FB = 60+ Pball v.g Pf. Vsub-g 3500 V.10= 60+ 1000. 1/1v.10 35000-V-5000 V = 60 V= 0.002kg { Fw= 35000.002. 10 = 70 N} check = 3. A trash can lid of mass 1.0 kg and area 0.20 m lies on top of a trash can but is not sealed shut in any way. The air inside the trash can is not moving. What minimum speed in m/s must air (density: 1.2 kg/m) blow over the top of the lid in order to pop it off (make its apparent weight zero)? Use g = 10 m/s 4. A 2-liter bottle is completely filled with sand (p sand = 2000 kg/m) and sealed. A 1-liter bottle is completely filled with granite dust (p granite = 2700 kg/m) and sealed. The bottles are then completely submerged in water (p water = 1000 kg/m). What is the ratio of the buoyant force on the sand-filled bottle to the buoyant force on the granite-filled bottle? ) sand Fw= 2000.2.10 Fb = 10002.10 granite Fw = 2700-1.10 / F = 1000-1.10 {Fb granite: Fb Sand 1:2}