Aconstant-head test was conducted on a sample of soil 150 mm long and 1963 mm² in cross- sectional area. the quantity of water collected was 5cm’ in 20 seconds under a head difference of 220 mm. the average temperature was 24°c. (a) calculate the hydraulic conductivity. (b) if the porosity of the sand is 55%, calculate the average velocity and the seepage velocity when the test was conducted.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

The proportional limit is always greater than the yield strength for a material. a)-trune b)- false

An electric kettle is made out of stainless steel, weighs two pounds (when empty) and is equipped with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling