(1) A 7.0 g ice cube at -20 ? C is in a rigid, sealed container from which all t
ID: 2124818 • Letter: #
Question
(1) A 7.0g ice cube at -20?C is in a rigid, sealed container from which all the air has been evacuated.
(2) The figure shows the pV diagram for a certain thermodynamic process. In this process, 1690 J of heat flows into a system, and at the same time the system expands against a constant external pressure of 6
A 7.0g ice cube at -20?C is in a rigid, sealed container from which all the air has been evacuated. How much heat is required to change this ice cube into steam at 180 The figure shows the pV diagram for a certain thermodynamic process. In this process, 1690 J of heat flows into a system, and at the same time the system expands against a constant external pressure of 6 times 104 Pa. If the volume of the system increases from 0.020 m3 to 8 times 10?2 m3, calculate the change in internal (thermal) energy of the system. If the internal (thermal) energy change is nonzero, be sure to indicate whether this energy change is positive or negative. A radio receiver can detect signals with electric field amplitudes as small as 300 What is the intensity of the smallest detectable signal?Explanation / Answer
total heat=0.007*2.108*(0-(-20))+0.007*334+0.007*4.187*(100-0)+0.007*2270+0.007*1.996*(180-100)=22.5718 kJ
2)change in internal eenrgy=heat inflow-work done
=1690-6*10^4*(0.08-0.02)=-1910 J
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.