The weight of a block of granite 1 ft × 2 ft × 4 ft is 1320 lb. If 12 blocks are used to build a wall 8 ft high, 12 ft long, and 1 ft wide, what is the pressure on the bottom faces? A) 4.58 lb/in² B) 9.17 lb/in² C) 18.3 lb/in² D) 36.7 lb/in²

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The total weight of 12 blocks is 12 × 1320 lb = 15840 lb. The area of the bottom face of the wall is 12 ft × 1 ft = 12 ft² = 1728 in². Pressure = Total weight / Area = 15840 lb / 1728 in² = 9.17 lb/in².

The Weight of a Block of Granite 1 Ft ×