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The volume of the plate is (0.5 x 20 x 45) = 450 cubic inchesThe weight is (450) x (0.28) = 126 pounds
That depends... on the composition of the steel !
8 inch x 12 inch solid? If so, then volume = 8/12 ft. x 1 ft. x 20 ft. = 13.3333.... cu.ft. Steel is ~ 490 pounds per cu.ft. 490 x 13.3333.... = ~ 6533.33 pounds.
If you can draw a line 1 inch long and divide it into 8 equal parts, then each of the segments would be an eighth of an inch long
A small eraser is about one inch long.