The current through a 20.0-mH inductor is LaTeX: i(t)=8t\exp(-t/5) i ( t ) = 8 t exp ⁡ ( − t / 5 ) for LaTeX: t\geq0 t ≥ 0 , where LaTeX: t t is given in seconds and LaTeX: i(t) i ( t ) is given in mA. What is the magnitude of the induced emf across the inductor when LaTeX: t=3.0~\mathrm{s} t = 3.0 s ?

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.

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false