A drainpipe 30 cm diameter lies beneath an earth dam. The pipe was partially clogged with sand. The discharge of the pipe was 300 lit/day when the difference between the dam's upstream and downstream water levels was 20 m. Calculate the clogged length, if the permeability of the sand was estimated to be 0.01 cm/sec.

Acarnot refrigerator operates in a room in which the temperature is 21°c and of power when operating. if the food compartment of the refrigerator is consumes 3 kw to be maintained at 2°c, determine (a) the coefficient of performance of the cycle and (b) the rate of heat removal from the food compartment. refrigerator cycle that has a higher coefficient of performance than that of the discussed (e) is it possible to develop a carn ot refrigerator, operating between the same temperature limits? explain