8. A student swings a 0.25 kg mass around in a vertical circle using a string of length 0.5 m The rock is swinging at a constant speed of 4 m's. What was the tension in the string when the mass is at the top of the swing? A. 5.5 B. 9.8 C. 10.5 D. 8 E. 2.5 9. Three blocks of the same size and shape are placed in a tank of water. The masses of the blocks are unknown. Blocks 1 and 2 are suspended from strings attached to spring scales. Both spring scales read 5 NV. Block 3 is floating as shown. 3 Rank the magnitudes of the buoyant forces on each of the blocks, from least to greatest. 2 A 3