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

Author Question: The Department of Energy develops a new reversible engine which has a COP of 4 when operated as a ... (Read 61 times)

nenivikky

  • Hero Member
  • *****
  • Posts: 516
on: Jul 27, 2018
The Department of Energy develops a new reversible engine which has a COP of 4 when operated as a refrigerator and a COP of 5 when operated as a heat pump. What is its efficiency when operated as an engine doing work?
 
  A) 10.
  B) 20.
  C) 25.
  D) 45.
  E) 80.

Question 2

Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly East of the point?
 
  A) 15. V
  B) 30. V
  C) 0.15 kV
  D) 30. kV
  E) impossible to calculate from the information given


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

isabelt_18

  • Sr. Member
  • ****
  • Posts: 342
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

B


nenivikky

  • Member
  • Posts: 516
Reply 2 on: Jul 27, 2018
Wow, this really help

Jossy

  • Member
  • Posts: 336
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

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.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Energy flow and chemical recycling in ecosystems. Energy flow and chemical recycling in ecosystems.
Changes in the free energy (DG) of exergonic and endergonic reactions Changes in the free energy (DG) of exergonic and endergonic reactions
All fuel injectors should make the same sound with the engine running at idle speed. A lack of sound ... All fuel injectors should make the same sound with the engine running at idle speed. A lack of sound ...
Air flows through the PCV valve during acceleration and when the engine is under a heavy load. Air flows through the PCV valve during acceleration and when the engine is under a heavy load.
Resonance transfer of energy in a light-harvesting complex Resonance transfer of energy in a light-harvesting complex
Energy Transfer Energy Transfer
Video: Nerve Impulse Transmission Animation

For a complete list of videos, visit our video library