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Fluids Practice Name 1. A 3.0 kg block hanging from a spring scate is submerged in a beaker of water until the spring scale reads 20 N. What is the buoyant force on the block? It cannot be determined without knowing the dimensions of the block. AP Physics 2 Test Booklet Fluids Practice A cube of mass m with sides of length 3 is completely submerged in a tank of uid ol density rand held in place by a string attached to the bottom of the tank. as shown above. The height of the uid is h. and the string has a nonzero tension Fr. 31. Which of the following indicates how the density of the cube compares with the density of the fluid and provides correct evidence for the comparison? (9 The tact that the cube is completely submerged is evidence that the density of the cube is greater than the density of the uid. The fact that the cube is completely submerged is evidence that the density of the cube is less than the density of the uid. the density of the uid. The fact that there is tension in the string is evidence that the density of the cube is less than the The fact that there is tension in the string is evidence that the density of the cube is greater than density of the uid