Un filo di manganina lungo 3 m e di sezione pari a 0,8mm² è collegato a una pila con f. e.m. di 1,8 V e resistenza interna di 0,4 Ω; calcolare l'intensità della corrente che circola nel filo e la tensione ai suoi estremi.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

What is the main objective of using reheat rankine cycle?