Question

someone check this work please

Answer 1

The Hubert H. Humphrey Metrodome in Minneapolis opened in 1982 at a cost of $55 million. To prepare for the footings, et cetera, 3.00 x 10^5 cubic yards of dirt were removed. The Metrodome's inflatable roof covers 10.0 acres and its interior volume is 60.0 x 10^3 cubic feet. During construction, 40.0 x 10^3 cubic yards of concrete, 11.9 x 10^3 tons of reinforcing steel, and 5.00 x 10^2 tons of structural steel were utilized. The roof material includes an outer layer of Teflon-coated glass and an inner layer of woven fiberglass. Given this information, answer the following:

If removed evenly over the 10.0 acres, how deep a hole would be formed as a result of the excavation?

yards=?

If the two-layer fiberglass roofing material has a mass of 0.667 lbm/ft^2, what is the total mass of the roof?

lbm=?

If 10.0 inches of wet snow collected on the roof (this happened in 1982), what is the added mass on the roof? (Assume 1 inch of water equals 10 inches of snow).

lbm=?

Answer 2

(a) 1 acre = 4840 square yards
10 acres = 4840 square yards
300000 cubic yards/4840 square yards = 62 yards

(b) 10 acres = 4840 square yards = 43560 sq ft
0.667 lbm/ft^2 times 43560 ft^2 = 29055 lbm

(c) Specific weight of water is 62.4 lb/ft^3
Spread to a thickness of 1 inch, this would cover 12 ft^2
So the 10-inch snow cover has a mass of 62.4 lbm/12 ft^2
Then multiply 62.4 lbm/12 ft^2 times 43560 ft^2 = 2.265 x 10^5 lbm

Answer 3

a)
1 acre = 4840 yd^2
3x10^5 yd^3 / 48400 yd^2 = 6.198 yd


b)
290545.2

I'm not sure c

Answer 4

10 acres = 48400 square yards not 4840

Answer 5

i see thanks