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Unformatted text preview: the escape speed at that radius. 3 4. Mary is vacationing in Salt Lake City, which is near a famous lake known for its high concentration of salt in the water. Mary has a mass of m =55 [kg], and an average body density of = 950 [kg m-3 ]. When bathing in the lake, she notices that 30% of her body is above the water level, while the remaining 70% is below the water level. (a) What is the density of Salt Lake? Use the balance between buoyant force and weight: V g = SL (0 . 7 V ) g SL = . 7 = 1357 (b) (Extra points) Is the knowledge of Marys mass necessary? And why? No, only the knowledge of the density is suFcient. USEUL CONSTANTS: G = 6 . 67 10-11 [N kg-2 m 2 ] g =9.8 [m s-2 ] 4...
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