he tower crane is used to hoist the 1.8-Mg load upward at constant velocity. The 2-Mg jib BD, 0.6-Mg jib BC, and 5.5-Mg counterweight C have centers of mass at G1, G2, and G3, respectively. Determine the resultant moment in kN·m produced by the load and the weights of the tower crane jibs about point A. ( in kN. m and assume counterclock wise as positive, clockwise as negative)

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?