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The mass of the hollow copper ball with a volume of 30 cm3 is 178 g. when the hollow part of the ball is filled with some liquid, the total mass of the ball is 314 g. what is the density of the injected liquid? (ρ Cu = 8.9g/cm3)
According to ρ = MV, the volume of copper in the ball is v copper = m ball, ρ copper = 178g8.9g/cm3 = 20cm3, the volume of hollow part is v air = 30cm3-20cm3 = 10cm3, when the hollow part of the ball is filled with a certain liquid, the volume of liquid is v liquid = V air = 10cm3, the mass of injected liquid is m liquid = m total - m ball = 314g-178g = 136g, note
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