Acantilever of length 0.5 m and square cross-section of sides 50 mm is subjected to a downward-acting alternating end load. the static tensile yield and fatigue strengths for completely reversed stress of the material are 300 mpa and 200 mpa. if the mean stress σm= 30 mpa, using the soderberg equation determine the maximum and minimum values of the end load. also show stress-time variation curve (sinusoidal).

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.