Nd replacement
Method [5]
Escplain three
O
phase
system
of
soil. [3]
Numerical Problem
A Sample of dry soil weighs 68 gm. Find
the volume of Voids if the total volume
of the sample is homi and the specific grauit
of Solid is 2.65. Also determine the void
ratio. [5 ]
-
A square footing on Sand failed by general
Shear under an un ultimate load of 6000 KN.
i moting was 2.5m below the

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.