Aheated long cylindrical rod is placed in a cross flow of air at 20°c (1 atm) with velocity of 10 m/s. the rod has a diameter of 5 mm and its surface has an emissivity of 0.95. if the surrounding temperature is 20°c and the heat flux dissipated from the rod is 15700 w/m2, determine the surface temperature of the rod. evaluate the air properties at 70°c. the properties of air (1 atm) at 70°c are k = 0.02881 w/m∙k, v = 1.995 × 10^−5 m2/s, and pr = 0.7177.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

What precautions should you take to prevent injuries when dealing with heavy loads?

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false