The volume of the hollow copper ball is 30cm3, the mass m = 178g. After the hollow part is filled with some liquid, the total mass m = 314g? (ρ Cu = 8.9 × 103 kg / m3)
From ρ Cu = m Cu V Cu, V Cu = m Cu, ρ Cu = 178g8.9g/cm3 = 20cm3, volume of hollow part, V liquid = 30cm3-20cm3 = 10cm3, ρ liquid = m liquid, V liquid = 314g − 178g10cm3 = 13.6g/cm3. A: the density of injected liquid is 13.6g/cm3
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