Aseries of direct shear tests was performed on a soil sample. each test was carried out until the specimen sheared (failed). the laboratory data for the tests are tabulated as follows. determine the soil’s cohesion and angle of internal friction. specimen number normal stress (ib/ft^2) shearing stress(ib/ft^2)1 200 4502 400 5203 600 5904 1000 740

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]