A wall footing has the following conditions. Determine the m…
A wall footing has the following conditions. Determine the moment capacity, Mn, of the footing. Assume the footing is 3 ft wide, the pressure that acts on the bottom of the footing is 6,133 psf, and the reinforcement is a #7 bar spaced every 12 inches.The bottom of the footing is at a depth of 2 ft below grade.The service dead load is 6 kips/ft, and the service live load is 7 kips/ft.The wall is 14 in. thick.The footing is 10 in. thick.The allowable soil pressure, qa, is 5,000 psf.The soil has a density of 130 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,300 psi and fy = 60,000 psi.
Read DetailsThe concrete containing Type I cement in a structure is cure…
The concrete containing Type I cement in a structure is cured for 3 days at 40°F, followed by 5 days at 71°F. Use the maturity concept to estimate its strength as a percentage of the 28-day strength under standard curing. Maturity is defined as M = Σ(Ti + 50)(ti) where Ti is in degrees F and ti is in days.
Read DetailsOne strand of a DNA double helix has the base sequence AGCTT…
One strand of a DNA double helix has the base sequence AGCTTAGGCTA. During replication, a point mutation occurs at the 7th base, changing it from G to T. a. Create the complementary base sequence for the opposite strand of the mutated DNA double helix. (2 marks) b. Identify the specific point mutation that has occurred. (1 mark)
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