A thermodynamic system undergoes a process in which 100 J of heat is released by

Question

A thermodynamic system undergoes a process in which 100 J of heat is released by the system. During this process 100 J of work done on the system. What is the change in thermal energy of the system? Increases by 200 J Decreases by 200 J Thermal Energy stays the same A child takes a pile of disordered blocks and stacks them into a very neat pyramid. How has total entropy changed in this process? Decreased Stayed the same Increased One wishes to design a heat engine that utilizes a hot reservoir consisting of combusted gases and a cold reservoir consisting of exterior atmosphere. What is the maximum possible efficiency for conversion of heat into work for such an engine? 100% 100%, but only if one is able to remove all dissipative effects from friction or turbulence Some efficiency less than 100%.

Explanation / Answer

1)H=U+W

H=-100

W=-100

so U=0

so energy remains the same

2)entropy has decreased since it is more organised now (at the macro level)

if we take thermodynamics in to account, it is still the same since there is no change in temperature os state

3)some efficieny less than 100% since some energy is always lost in the form of heat energy

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