Plot the change in specific enthalpy as a function of final temperature for the following gases, each of which is initially at 25°C:
(a) hydrogen, (b) nitrogen, (c) air, (d) carbon dioxide. Assume each gas behaves as an ideal gas with constant specific heats,
and consider a final temperature range of 0°C to 100°C.
Given: T1 = 25°C
What will be an ideal response?
For an ideal gas with constant specific heats: ?h = cp (T2 – T1)
For the constant-pressure specific heats: (a) H2 : cp = 14.307 kJ/kg-K; (b) N2: cp = 1.039
kJ/kg-K; (c) air: cp = 1.005 kJ/kg-K; (d) CO2: cp = 0.846 kJ/kg-K (at 300 K)
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The Hubert H. Humphrey Metrodome in Minneapolis, Minnesota opened in 1982 at a cost of $55 million. To prepare for the footings, etc., 300 000 cubic yards of dirt were removed. Its inflatable roof covers 10.0 acres and its interior volume is 60.0 × 106 cubic feet. During construction, 40.0 × 103 cubic yards of concrete, 11.9 × 10³ tons of reinforcing steel, and 5.00 × 10² tons of structural steel were utilized. The roof material includes an outer layer of Teflon-coated fiberglass and an inner layer of woven fiberglass. Given this information, answer the following:
(a) If removed evenly over the 10 acres, how deep of a hole would be formed as a result of the excavation? (b) What is the total mass of concrete and steel in lbm? (c) If the two-layer fiberglass roofing material has a mass of 0.6667 lbm/ft², what is the total mass of the roof? (d) If 10.0 in. of wet snow collected on the roof (this happened in 1982), what is the added mass to the roof ? (Assume 1 in. of water equals 10 in. of snow.)
In a typical site-cast reinforced-concrete structure, the cost of formwork and shores is
A) approximately 25% of the combined cost of concrete and steel. B) approximately 50% of the combined cost of concrete and steel. C) approximately 75% of the combined cost of concrete and steel. D) approximately equal to the combined cost of concrete and steel. E) none of the above.
What turkey is most commonly raised for meat?
What will be an ideal response?
Select a process used to make manufactured composites.
A. layering process B. lamination C. vacuum bag forming D. both a and c