During a field density tst 1850 g of soil was excavated from a hole having a volume of 900 cm3. The oven-dried mass of the soil was 1630 g. Determine the moisture content, dry density, void ratio and degree of saturation.

Cold water (cp=4180j/kg k) leadıng to a shower enters a thin-walled double-pipe heat transfer at 15c at a rate of 0.25kg/s and is heated to 45c by hot water (cp=4190j/kg k) that enters at 100c at the rate of 3kg/s. if the overall heat transfer coefficient is 950w /m2 k , determıne the rate of heat transfer and the heat transfer surface area of the heat exchanger using e - ntu method