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Erected a new sign welcoming people to the campus. The sign is painted on a rectangle of graphite reinforced epoxy which will not bend and measures 3 ft high and 5 ft wide. This sign is fastened along its 3 ft side to a hollow 2014-T6 aluminium (allowable shear stress = 30 ksi) pole 50 ft tall and 6 inches in diameter. On a very windy day at Dartmouth, the wind force on the sign is observed to be 5 kips. Determine the minimum wall thickness of the pole after incorporating a factor of safety of 2
noting that a person standing in a room maintained at 20degc at all times the inner surfaces of the walls floors and
large cylindrical bales of hay used to feed livestock in the winter months are d2m in diameter and are stored
an adiabatic gas turbine using helium has inlet conditions 5 mpa and 500degc and outlet conditions of 50 kpa and
air flows in a channel whose velocity at 3 neighbouring points ab and c which are 10 cm apart are shown in the
12 lbm of carbon c reacts with 24 lbm of oxygen o2 to form 22 lbm of carbon dioxide co2 plus an unknown amount of
during some actual expansion and compression processes in piston-cylinder devices the gases have been observed to
a part of an inspection system in a packaging operation uses a jet of air to remove imperfect cartons from a conveyor
a 30-l electrical radiator containing heating oil is placed in a 50 m3 room. both the room and the oil in the radiator
air enters a converging-diverging nozzle of a supersonic wind tunnel at 1 mpa and 37 ordmc with a low velocity. the
in a 1-shell and 2-tube heat exchanger cold water with inlet temperature of 20 degree c is heated by hot water supplied
the temperature distribution in a fluid is given by t 10x 5y where x and y are the horizontal and vertical coordinates
Assume they test null hypothesis H0: versus H1: Will the engineers decide to use the steel if H0 is rejected? Will the engineers decide to use the steel if H0 is not rejected?
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