A piece of copper having an internal cavity weighs 264 g in air and 221 g in water, Find the volume of the cavity. (Take density of copper is 8.8 g/cc)

The volume of the piece = Mass of it in air / Density of copper Vcopper=264/88=30 cc The volume of water displaced =Buoyant Force/fw×g Buoyant Force = Charge in weight =264g−221g=43g The volume of water displaced =43g/1 gm/cc×g=43 cc The volume of the piece including cavity = Volume of water displaced Vtotal=43 cc The volume of cavity =Vtotal−Vcopper=43−30 The volume of cavity =13 cc

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