Author Question: A heating element having a resistance (at its operating temperature) of 148 is connected to a ... (Read 62 times)

tiara099

  • Hero Member
  • *****
  • Posts: 588
A heating element having a resistance (at its operating temperature) of 148  is connected to a battery having an emf of 523 V and unknown internal resistance.
 
  It is found that thermal energy is being generated in the resistance of the heating element at a rate of 66.0 W. What is the rate at which thermal energy is being generated in the internal resistance of the battery?

Question 2

Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a thermodynamic pump.
 
  What is its thermal efficiency when operated as a thermodynamic engine doing work? A) 10
  B) 20
  C) 25
  D) 45
  E) 80



amynguyen1221

  • Sr. Member
  • ****
  • Posts: 355
Answer to Question 1

283 W

Answer to Question 2

B



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Did you know?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

For a complete list of videos, visit our video library