0.116 pounds per cubic inch
156/12 = 13 ft-pounds
Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
You can't say 'pressure per square inch. It's just 'pressure', which equals force per square inch. You divide the person's weight by the area of the foot in contact with the stairs to get the answer.
there are 12 inches in one foot
120 inch pounds = 10 foot pounds.
Such that there are 12 inches in one foot, there are 12 inch pounds in one foot pound. Therefore, 5 foot pounds is equal to 12 x 5 = 60 inch pounds.
To convert inch-pounds to foot-pounds, divide by 12. So, 1824 inch-pounds is equal to 152 foot-pounds (1824 / 12).
0.116 pounds per cubic inch
Gypsum or plaster board3 3/8 inch 1.56 pounds per square foot 1/2 inch 2.08 pounds per square foot 5/8 inch 2.60 pounds per square foot
156/12 = 13 ft-pounds
18 ft-lbs = 216 in-lbs
152 pounds
400 pounds 400 pounds
about 75-86 pounds
About 120-133 Pounds
Approximately 3 pounds per foot.