## geerky42 2 years ago Two blocks (with masses 20.5 kg and 68 kg) are connected by a string as shown. The pulley is frictionless and of negligible mass. The coeﬃcient of kinetic friction between block and machine is 0.257. Find the change in the kinetic energy of the block on the incline as it moves a distance of 15.4 m up the incline if the system starts from rest.

1. geerky42

2. geerky42

first, I have to set up equation for sum of force, find net force, then multiply it by the distance, right?

3. ndwelsh

reported abusive - CHEATING !!!!

4. geerky42

How is that cheat? I'm looking for a way to solve this problem.

5. geerky42

And my way doesn't work.

6. ndwelsh

So, report that problem as something you didn't solve

7. ndwelsh

everything else is on the side. Understood?

8. ndwelsh

are you learning physics or building problem solving skills?

9. geerky42

I just need help, I can't figure out how solve this problem... Thats why I am here... Isn't it what Openstudy is for?

10. geerky42

Both...?

11. ndwelsh

you can't cheat, this has to be stopped. Ask this question out of your knowledge of theory.

12. Yahoo!

hey @greeky42 he is just trolling just ignore him

13. ndwelsh

speak to me directly, like this: Aren't you trolling now?

14. ndwelsh

that's concern #1

15. ndwelsh

do not assume for me. Is that clear?

16. geerky42

And my theory is apparently wrong, and I don't know why. And it's isn't cheating. You are obviously trolling, just like Yahoo! said.

17. Yahoo!

$W = \Delta K.E$

18. Yahoo!

intial K.E is 0 brcoz the body was at rest..)

19. ndwelsh

It's not *YOUR* theory, it's your knowledge.

20. ndwelsh

so, it's knowledge which is wrong, theory is always there.

21. geerky42

@Yahoo! And $W = x \sum F$ right?

22. geerky42

My knowledge* Better, knowledge nazi?

23. Callisto

Sorry to interrupt. I think it's better to stop the discussion on cheating here. And also, it's okay to seek help for your homework, as long as you're looking for a way to learn how to do it, not just copying others work. @ndwelsh I think we'd better have a private talk.

24. ndwelsh

what is fun about substituting numbers to formulas? Aren't you striving for better degree? What are you supposed to learn? Physics, elementary principles of expressions and variables?

25. ndwelsh

@Callisto - who am I talking to now?

26. Yahoo!

nw ur job is to Find Work done..By the Body on incline

27. ndwelsh

Whatever you are trying to achieve in the future will unfold improperly. MARK MY WORDS NOW, bunch of puppets

28. Yahoo!

$W=F.S.\cos \theta$

29. geerky42

@ndwelsh Like, you think I take physics for absolutely no reason? Sure... And you are here, trolling and claiming everyone is cheating... I think your life has been unfolded improperly.

30. Yahoo!

Or another way to approach this is find accl

31. ndwelsh

Hold on there horse, don't you say "trolling" regarding my name any more? It's your stupid cheating Wikipedia type of philosophy that explains your inadequacy better than my life.

32. ndwelsh

answer now, what's wrong about using reference books better than theory books?

33. ndwelsh

Apparently I'm more knowledgable in this topic than you are

34. geerky42

Yet, I don't need you, fortunately. There are knowledgable beings who are wise enough not to troll in this site and are willing to help others. What about you? Answer now. What do you do with your life? Trolling? Well, that's pathetically sad. Beside you are wasting your time.

35. geerky42

@Yahoo! How can I find acceleration? its seems that there is not enough information.

36. ndwelsh

discussing my life at this point seems to be more off the topic. --- THAT'S FOR ADMINS TO TAKE NOTE don't you SPIT THAT POISON IN MY FACE, fraking DOLL?

37. ndwelsh

JUST GET THAT, CHEATER - BECOME PUNISHED FOR THAT IN FUTURE

38. geerky42

@ndwelsh Delight me.