Apin fin of uniform, cross-sectional area is fabricated of an aluminum alloy (k 160 w/m k). the fin diameter is d 4 mm, and the fin is exposed to convective conditions characterized by h 220 w/m2 k. it is reported that the fin efficiency is f 0.65. determine the fin length l and the fin effectiveness f . account for tip convection.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.