Work and energy

  • Thread starter darkmagic
  • Start date
  • #1
164
0

Homework Statement



Can someone teach me on how to solve this problem? This is a dynamics mechanics problem. I tried everything I know but I cannot really get the answer. Please help ASAP.

Homework Equations





The Attempt at a Solution

 

Attachments

  • problem.JPG
    problem.JPG
    9.5 KB · Views: 320

Answers and Replies

  • #2
164
0
Please someone explain to me...
 
  • #3
berkeman
Mentor
59,428
9,543

Homework Statement



Can someone teach me on how to solve this problem? This is a dynamics mechanics problem. I tried everything I know but I cannot really get the answer. Please help ASAP.

Homework Equations





The Attempt at a Solution


When you say that you've tried everything that you know, what have you tried? What approaches? Why do you think that the section that this problem is from is titled "Work and Energy"?

BTW, I get a different answer than is shown. Are you sure about those numbers?
 
  • #4
164
0
it involves the work-energy equation. the answer is from my teacher.
 
  • #5
berkeman
Mentor
59,428
9,543
it involves the work-energy equation. the answer is from my teacher.

So what can you tell us about the relationship between work and energy? How do you think it applies to this problem?

If I understand the problem statement, a train car or whaver coasts up a grade with some initial velocity, and they want to know what the final backward velocity will be after it goes up, stops, and accelerates back down the grade. What kind of energy equations would you use to approach this?
 
  • #6
164
0
the equation that involves in that problem is summation of XS=1/2 W/g [v2 - vo2]
 
  • #7
berkeman
Mentor
59,428
9,543
the equation that involves in that problem is summation of XS=1/2 W/g [v2 - vo2]

Sorry, you're going to have to define the terms in that equation for me. And in defining the terms in your own words, you might just talk yourself to the solution of the problem...

Well, except that I still think the posted answer has a typo in it....
 

Related Threads on Work and energy

  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
2
Replies
25
Views
3K
  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
1
Views
7K
  • Last Post
Replies
5
Views
2K
Replies
0
Views
5K
Replies
3
Views
2K
Replies
12
Views
3K
Top