The village shaman is up to no good again. Having calibrated their pulley system, they now havea constant source of perfect liquid (cp,l = 5R) potion at T = 20.0°C. They would now like dispersethe potion amongst the villagers for some likely nefarious purpose... They decide to convert it toa vapor (Cp,v 15R) and let it then become an aerosol, which the villagers will inhale unsuspect-ingly. The potion is known to vaporize at 70°C with an enthalpy of vaporization Ahvap = 25 kJ/mol.= (a) With the wind blowing northwest at 5 m/s, the shaman decides to send 104 moles of potionthe villagers way. How much heat will they need to raise the temperature of the potion to 90°Cand let it blow away?Ack! The plan didn't work at all... The shaman forgot to account for the distance to the vil-lage, and all the potion ended up condensing after traveling 1000 m due to heat-exchange withair and falling to the ground well before reaching the village. Forecast says that it will be 15°Ctomorrow with northwest winds again at 4 m/s.(b) Considering that the village is 1600 m away (the shaman knows this since they time theirmile-runs this way), to what temperature should the shaman heat the potion to ensure that itreaches the village at the time of condensation? In solving this problem, you may wish to considerdifferent limiting cases for the shaman to make an informed decision (there is a difference betweenan estimate for which all the potion arrives as vapor to the village versus one molecule of it).

(a) Given data: Wind speed: 5 m/s Amount of potion: n = 104 moles Initial temperature: 20°C Final…

The village shaman is up to no good again. Having calibrated their pulley system, they now have a constant source of perfect liquid (Cp,l = 5R) potion at T = 20.0°C. They would now like disperse the potion amongst the villagers for some likely nefarious purpose... They decide to convert it to a vapor (cp,v = 15R) and let it then become an aerosol, which the villagers will inhale unsuspect- ingly. The potion is known to vaporize at 70°C with an enthalpy of vaporization Ahvap = 25 kJ/mol.

The village shaman is up to no good again. Having calibrated their pulley system, they now have a constant source of perfect liquid (Cp,l = 5R) potion at T = 20.0°C. They would now like disperse the potion amongst the villagers for some likely nefarious purpose... They decide to convert it to a vapor (cp,v = 15R) and let it then become an aerosol, which the villagers will inhale unsuspect- ingly. The potion is known to vaporize at 70°C with an enthalpy of vaporization Ahvap = 25 kJ/mol.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

The village shaman is up to no good again. Having calibrated their pulley system, they now have
a constant source of perfect liquid (cp,l = 5R) potion at T = 20.0°C. They would now like disperse
the potion amongst the villagers for some likely nefarious purpose... They decide to convert it to
a vapor (Cp,v 15R) and let it then become an aerosol, which the villagers will inhale unsuspect-
ingly. The potion is known to vaporize at 70°C with an enthalpy of vaporization Ahvap = 25 kJ/mol.
=

(a) With the wind blowing northwest at 5 m/s, the shaman decides to send 104 moles of potion
the villagers way. How much heat will they need to raise the temperature of the potion to 90°C
and let it blow away?
Ack! The plan didn't work at all... The shaman forgot to account for the distance to the vil-
lage, and all the potion ended up condensing after traveling 1000 m due to heat-exchange with
air and falling to the ground well before reaching the village. Forecast says that it will be 15°C
tomorrow with northwest winds again at 4 m/s.
(b) Considering that the village is 1600 m away (the shaman knows this since they time their
mile-runs this way), to what temperature should the shaman heat the potion to ensure that it
reaches the village at the time of condensation? In solving this problem, you may wish to consider
different limiting cases for the shaman to make an informed decision (there is a difference between
an estimate for which all the potion arrives as vapor to the village versus one molecule of it).

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