A 2.5 kg collar is attached to a spring and slides without friction in avertical plane along the curved rod ABC. The spring is undeformed when the collar isatCandk= 450 N/m. If the collar is released from rest atA, determine the velocityof the collar: (1) as it passes throughB, and (2) as it reachesC.

Agas mixture with a compostion of 55 methane, 30% propane, and 15 butane by volume) is compressed from 1 bar and 25°c to 9bar in a compressor with an isentropic efficiency of 85%. the environment has a temperature of to25 c. determine (a) the exit temperature of the mixture (b) the specific work required to run the compressor (c) the specific entropy generation of the process (d) the specific exergy destruction of the process (e) the second law efficiency of the compressor