4. A horizontal board of negligible thickness and area 1.0 m2 hangs from a spring scale that reads 60 N when a 4.0 m/s wind moves above the board. The air below the board is stationary. What does the scale read when the wind stops? The density of air is 1.25 kg/m3. a) 50 N // // b) 55 N c) 60 N d) 65 N e) 70 N 5. An open container of water is filled to the very top. A 3 kg block with a density between 500 - 700 kg/m3 is placed in the container and floats (does not touch the bottom). What volume of water flowed over the container edge when the block was added? (1000 liters = 1 m3) a) 3 liters b) 5 liters c) 7 liters d) no water flows over the edge e) the exact value of the block's density is needed to determine