Air at 20°c and 1 atm flows over a spherical object at 1 m/s. the sphere has a diameter of 10mm and its initial temperature is 134°c. if the density, specific heat, and conductivity of the sphere are 7832 kg/m”, 549 j/kg. k, and 49.2 w/m. k, respectively, calculate the temperature at the center of the sphere after 100 seconds.

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.