1 Thermodynamics
A thermally insulated rigid container contains an ideal gas heated by a filament of resistance 100W through a current of 1A for 5 min then change in internal energy is
1) 0 KJ 2) 10 KJ 3) 20 KJ 4) 30 KJ
Solution
Volume of ideal gas is constant so W=PΔV=0
ΔQ=ΔU ⇒ΔU=i2Rt=12×100×5×60 =30 ×103 = 30kJ
Your Score:
