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Answer» Concepts: The buoyant force
Reasoning: When an object FLOATS, the magnitude of the buoyant force is EQUAL to the magnitude of its weight.
Details of the calculation: The magnitude of the buoyant force is equal to the the magnitude of the weight wliquid of the displaced liquid. wliquid = ρliquidVg. The volume V of the displaced liquid is the volume of ONE HALF sphere, V = 2πr3/3 = 2π(6cm)3/3 = 452cm3. The magnitude of the weight of the object is wobject = mfrogg. (We are neglecting the weight of the air-filled pod.) ρliquidVg = mfrogg. mfrog = 1.35(g/cm3)452cm3 = 610g.
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