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

Author Question: In a problem using energy considerations to solve for the speed of a ball thrown from the top of a ... (Read 13 times)

dmcintosh

  • Hero Member
  • *****
  • Posts: 517
on: Jul 28, 2018
In a problem using energy considerations to solve for the speed of a ball thrown from the top of a building when it strikes the ground below, where should the potential energy have its zero value?
 a. It should be at the level from where the ball is thrown.
  b. It should be at the ground level where the ball hits.
  c. It should be slightly below ground level so the potential energy is always positive.
  d. It doesn't matter since only differences in potential energy matter in solutions.

Question 2

An electrical generating plant operates at a boiler temperature of 220C and exhausts the unused heat into a nearby river at 19C. If the generating plant has a power output of 800 megawatts (MW) and if the actual efficiency is 3/5 the theoretical efficiency, how much heat per second must be delivered to the boiler? (0C = 273 K)
 a. 5200 MW
  c. 3270 MW
  b. 1810 MW
  d. 2620 MW


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

blakeserpa

  • Sr. Member
  • ****
  • Posts: 338
Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

C


dmcintosh

  • Member
  • Posts: 517
Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

brbarasa

  • Member
  • Posts: 308
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

13 Ball 13 Ball
Twelve primary energy channels and the Conception and Governing Vessels of Traditional Chinese ... Twelve primary energy channels and the Conception and Governing Vessels of Traditional Chinese ...
Answer to physics problem Answer to physics problem
An athlete stretches a spring an extra 40.0 cm beyond its initial length. How much energy has ... An athlete stretches a spring an extra 40.0 cm beyond its initial length. How much energy has ...
linear programming problem, applying simplex method and sensitivity analysis linear programming problem, applying simplex method and sensitivity analysis
How do you solve this 3x^2 -7x +2 and (x-1)^2 + (y-7)^2 =6 How do you solve this 3x^2 -7x +2 and (x-1)^2 + (y-7)^2 =6
Video: Osteoporosis

For a complete list of videos, visit our video library