A 240V single phase 6000 W heavy duty commercial electric heater runs constantly for 36 hours. If electricity cost $0.13/kWh, how much does it cost to run the heater? a. $28
b. $0.78
c. $18.72
d. $7.80

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?

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?

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