試題詳解

複選題
21. An object hangs from a spring balance. The balance indicates 30 N in air and 20 N when the object is submerged in water. What mass of the object would weigh 20N by the balance when the object is submerged in a liquid with a density that is half that of water? Take g = 10 m/s². (AB)20N (AC)25N(AD)30N(AE)35N (BC)40N (BD)一律送分