An inventor tries to sell you his new thermodynamic engine that ...

[nevelica]

An inventor tries to sell you his new thermodynamic engine that takes in 40 J of energy at 87C on each cycle, expels 30 J at 27C, and does 10 J of work.
 
  Would it be wise to invest in this engine? Back up your conclusion with numerical calculations.

Question 2

A 500-nm-wavelength beam of light illuminates a soap film with air on both sides and an index of refraction 1.33.
 
  If the beam of light is incident normally on the film, what is the minimum thickness of the film to make the reflected light enhanced in brightness? A) 47.0 nm
  B) 74.0 nm
  C) 94.0 nm
  D) 152 nm
  E) 268 nm

[aham8f]

Answer to Question 1

Save your money He has claimed an efficiency of 25, but the greatest possible efficiency for an engine operating between these temperatures is only 17, for a Carnot engine.

Answer to Question 2

C

[nevelica]

Thanks

[aham8f]

Welcome