This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: An inventor tries to sell you his new thermodynamic engine that takes in 40 J of energy at 87C on ... (Read 92 times)

nevelica

  • Hero Member
  • *****
  • Posts: 563
on: Jul 29, 2018
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


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

aham8f

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 29, 2018
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

  • Hero Member
  • *****
  • Posts: 563
Reply #2 on: Jul 29, 2018
Thanks


aham8f

  • Sr. Member
  • ****
  • Posts: 336
Reply #3 on: Jul 29, 2018
Welcome :)


« previous next »
 

Did you know?

Human kidneys will clean about 1 million gallons of blood in an average lifetime.

Did you know?

More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

Did you know?

Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Methane combustion as an energy–yielding redox reaction. Methane combustion as an energy–yielding redox reaction.
Some energy interconversions in living organisms Some energy interconversions in living organisms
A compression gauge designed for the higher compression rate of a diesel engine should be used when ... A compression gauge designed for the higher compression rate of a diesel engine should be used when ...
To measure engine oil pressure, remove the oil pressure sending (sender) unit usually located near ... To measure engine oil pressure, remove the oil pressure sending (sender) unit usually located near ...
When the cover is removed from the top of the engine, a mouse or some other animal nest is ... When the cover is removed from the top of the engine, a mouse or some other animal nest is ...
The leptin–melanocortin pathway of energy balance The leptin–melanocortin pathway of energy balance
Video: Gas exchange - partial pressure, locations, external and internal respiration

For a complete list of videos, visit our video library