Atimber beam consists of three 50 x 200 mm planks fastenedtogether
to form an i-beam 200 mm wide x 300 mm deep. if theflexural stress
of point a of the cross section is 7.5 mpa (intension),
determine:
a) the flexural stress at point b of the cross section.
b) the flexural stress at point c of the cross section.
c) the flexural stress at point d of the cross section.

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.