1.1.8 What is the difference between the two mine winches shown in figures 1.1.8 A and 1.1.8B?
two sheave
wheels
sheave wheel
winds
here
(1)
U
cage
and skip
unwinds
here
cage
and
skip
winch drum
10t
counter
weight
100
Figure 1.1.8 A
Figure 1.1.8 B

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis