T-4. The First Law of Thermodynamics -heat flows into the gas beat flows out of
ID: 1580856 • Letter: T
Question
T-4. The First Law of Thermodynamics -heat flows into the gas beat flows out of the gas there is no beat flow in or out any of these is possible. Explain your reasoning. Questions for discussion Would your answer differ if the gas underwent isothermal compression? In the following. you may ossume that all of the processes described are reversible. 1. When an ideal gas undergoes adiabatic expansion1, the temperature 4. If heat is added to a gas while the gas is held at constant valume, then the temperature of the gas -goes down stays the gnme _ may do any of these. must increase must decretse must stay the same Explain your reasoning. may do any of these Explnin your reasoning. Would your answer differ if the gas underwent adiabatie compression? Suppose instend that the same amount of heat is added to the gns while the gas is held at constaat pressure and the volume is allowed to vary. In this case, it turns out that the qualtative effect on the temperature is the same: namely, the temperature increases. But will it increase by the same amount? Explain. 2. When an ideal gas undergoes isothermal oompression, the internal energy of the gas stays the same may do any of theee. Explain your reasoning. b. When you let air out of a tire, the air feels cool. Explain. [Hint: air is a poor thermal conductor so this process is approximately adinbaticJ Would your answer dilfer if the gas underweat isothermal expansion?Explanation / Answer
According to the given problem,
1.) Ans: 4 May- do any of these,
Reason: In adiabatic process Heat exchance will be zero means Q = 0, but if the gas change anyway it wants and temparature may vary accordingly
When it compresses, Temparature always increase as work done increase.
2.) Ans : Stays the same.
Reason: Internal energy is due to motion of particles in a system. As internal energydepends on temperature. As we know temperature in isothermal process is constant so the internal energy will also be constant thus the change in internal energy will be zero.
3.) Question is not visible.
4.) Ans: must increase,
Reason: As contatn volume implies work zero and If heat is added to the system its internal energy will increase and so does the temparature.
NO it will not increase by same amout,
Reason:Here in isobaric process, W + internal energy = heat added so, it will be distributed according between work and internal energy in raising the temparature.
5.) Air is tire is compressed means volume remains. When you let air out your pressure decrease so does the temparture of air being cool.
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