« previous next »

Author Question: During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of ... (Read 44 times)

ENagel

  • Hero Member
  • *****
  • Posts: 540
on: Jul 29, 2018
During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of heat. What is its efficiency?
 
  What will be an ideal response?

Question 2

A blacksmith is flattening a steel plate having dimensions 10 cm  15 cm  1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
 
  at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. ( = 5.67  10-8 W/m2  K4 )
  A) 360 W
  B) 760 W
  C) 790 W
  D) 850 W
  E) 880 W


cdmart10

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jul 29, 2018
Answer to Question 1

25

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

Did you know?

Approximately 25% of all reported medication errors result from some kind of name confusion.

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

Did you know?

People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

Urea cycle Urea cycle
Release of Acetylcholine During the Sleep–Waking Cycle Release of Acetylcholine During the Sleep–Waking Cycle
Inline four-cylinder engine showing principal and nonprincipal ends. Normal direction of rotation is ... Inline four-cylinder engine showing principal and nonprincipal ends. Normal direction of rotation is ...
Notice how clean the engine appears. This is a testament of proper maintenance and regular ... Notice how clean the engine appears. This is a testament of proper maintenance and regular ...
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.
It’s Easy To Look Sharp When You Haven’t Done Any Work It’s Easy To Look Sharp When You Haven’t Done Any Work
Video: How eudicots (true dicots) differ from monocots Animation

For a complete list of videos, visit our video library