Estimate the equilibrium temperature of a long rotating cylinder of diameter d, and oriented in space with its axis normal to the sun’s rays. the cylinder is at a location in space where the irradiation from the sun (i. e., energy incident on a surface perpendicular to the sun’s rays per unit time per unit area) is 1500w/m^2. assume that the absorptivity of the surface of the cylinder to solar radiation, αs, is equal to its emissivity ε. and the outer space is a blackbody at 0 k.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan

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.