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mayankdevnani Group Title

A steam engine has an efficiency of 20%.It is given an energy of 1000 cal.per minute.What is the actual work done by it in joule and in calories? a) 100 cal,800 J b) 200 cal,873 J c)10 cal,80 J d)100 cal,100 J

  • one year ago
  • one year ago

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  1. mayankdevnani Group Title
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    @amistre64 @ParthKohli @hartnn @Callsito @Zarkon @Hero @.Sam. @estudier @ganeshie8 @ajprincess @Algebraic!

    • one year ago
  2. mayankdevnani Group Title
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    @Callisto

    • one year ago
  3. amistre64 Group Title
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    im not sure since we havent gone over this in my physics class yet, but i would say that 20% efficiency means that 20% of the 1000 cals are used; giving us 200 cals in the answer at least

    • one year ago
  4. SheldonEinstein Group Title
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    May I help?

    • one year ago
  5. amistre64 Group Title
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    please do :)

    • one year ago
  6. mayankdevnani Group Title
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    ofcourse @SheldonEinstein

    • one year ago
  7. SheldonEinstein Group Title
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    ;) OK so first of all what @amistre64 discussed in his previous comment is very imp. to do this quest., so @mayankdevnani do you know what does efficiency mean?

    • one year ago
  8. mayankdevnani Group Title
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    ok @amistre64 then

    • one year ago
  9. mayankdevnani Group Title
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    yaa

    • one year ago
  10. mayankdevnani Group Title
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    efficiency=winout/winin*100

    • one year ago
  11. mayankdevnani Group Title
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    right @SheldonEinstein

    • one year ago
  12. SheldonEinstein Group Title
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    Yeah or in simpler words it is : \(\large{\frac{\textbf{Output}}{\textbf{Input}}\times 100}\) it is 100%...

    • one year ago
  13. mayankdevnani Group Title
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    yaa

    • one year ago
  14. SheldonEinstein Group Title
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    So, what we have is output/input * 100% = 20% , correct?

    • one year ago
  15. mayankdevnani Group Title
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    correct

    • one year ago
  16. SheldonEinstein Group Title
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    Ok so now, let me understand the second line of the quest. , is the output = 1000 calorie ?

    • one year ago
  17. mayankdevnani Group Title
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    yaa

    • one year ago
  18. mayankdevnani Group Title
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    then

    • one year ago
  19. mayankdevnani Group Title
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    @SheldonEinstein then

    • one year ago
  20. SheldonEinstein Group Title
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    Oh sorry wait!

    • one year ago
  21. mayankdevnani Group Title
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    yaa

    • one year ago
  22. SheldonEinstein Group Title
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    I am getting diff. answer so I am checking it, sorry , it will require some patience.

    • one year ago
  23. mayankdevnani Group Title
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    ok

    • one year ago
  24. SheldonEinstein Group Title
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    Quest. is wrong

    • one year ago
  25. mayankdevnani Group Title
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    why?? no it is right

    • one year ago
  26. SheldonEinstein Group Title
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    Time is not given.. though if you take 1 minute it is 200 cal.

    • one year ago
  27. mayankdevnani Group Title
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    yaa

    • one year ago
  28. SheldonEinstein Group Title
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    See , Power = 1000 cal/minute (given)

    • one year ago
  29. SheldonEinstein Group Title
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    use this and you will get 200 cal. as answer.

    • one year ago
  30. mayankdevnani Group Title
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    so what's the work done?

    • one year ago
  31. SheldonEinstein Group Title
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    W = P * time if T = 1 second , W = P ... that's it , find P(output) .. (using efficiency = Ouput/Input *100%) in Cal. per minute , that will be your answer

    • one year ago
  32. SheldonEinstein Group Title
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    200 cal.... = WORK DONE

    • one year ago
  33. mayankdevnani Group Title
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    no

    • one year ago
  34. mayankdevnani Group Title
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    but the work done is in joule

    • one year ago
  35. mayankdevnani Group Title
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    @ParthKohli @Preetha

    • one year ago
  36. mayankdevnani Group Title
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    @SheldonEinstein

    • one year ago
  37. mayankdevnani Group Title
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    @myininaya

    • one year ago
  38. SheldonEinstein Group Title
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    Is my answer correct, i.e. 200 cal, 873 J ?

    • one year ago
  39. mayankdevnani Group Title
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    yaa

    • one year ago
  40. SheldonEinstein Group Title
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    So where is the problem? ?? ? ?

    • one year ago
  41. mayankdevnani Group Title
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    873 J how??

    • one year ago
  42. mayankdevnani Group Title
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    @amriju

    • one year ago
  43. mayankdevnani Group Title
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    @SheldonEinstein how you got it 873J

    • one year ago
  44. SheldonEinstein Group Title
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    I got 200 Cal, and it is in options, soo....

    • one year ago
  45. mayankdevnani Group Title
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    but it's wrong

    • one year ago
  46. mayankdevnani Group Title
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    i need solution

    • one year ago
  47. mayankdevnani Group Title
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    can you help me @amriju

    • one year ago
  48. SheldonEinstein Group Title
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    200 cal * 4.184 = 836 J (approx. ) not equal to 873 Joule , hence I think the options are wrong..

    • one year ago
  49. mayankdevnani Group Title
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    no it was not wrong

    • one year ago
  50. amriju Group Title
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    work done is 20 percnt of the energy given...thats efficiency....so per minute is 20percnt of 1000 cal...thats 200 cal...convert to joules

    • one year ago
  51. mayankdevnani Group Title
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    so 1cal.=? j @amriju

    • one year ago
  52. amriju Group Title
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    4.2...approx..the correct is 4.187...

    • one year ago
  53. mayankdevnani Group Title
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    is it 4.37

    • one year ago
  54. amriju Group Title
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    nope

    • one year ago
  55. mayankdevnani Group Title
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    why??

    • one year ago
  56. amriju Group Title
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    thats how it is defined...both are units...and 1 cal is defined as 4.187 joules...

    • one year ago
  57. SheldonEinstein Group Title
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    That is what I was saying @amriju

    • one year ago
  58. mayankdevnani Group Title
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    in my solution book...the answer is as follows- \[\frac{20}{100}=\frac{W}{1000}=200 calorie\] OR \[200\times4.37=873J\]

    • one year ago
  59. mayankdevnani Group Title
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    is that right?? @amriju and @SheldonEinstein

    • one year ago
  60. SheldonEinstein Group Title
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    That is wrong, 1 Cal. = 4.187 Joule NOT 4.37 joule...

    • one year ago
  61. mayankdevnani Group Title
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    ok... thnx... @SheldonEinstein and @amriju

    • one year ago
  62. amriju Group Title
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    u may jst check on wikipedia...and its seems that none of the options are correct...the closest being 200, 837

    • one year ago
  63. amistre64 Group Title
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    just for reference http://www.wolframalpha.com/input/?i=200+calorie+to+joule

    • one year ago
  64. amistre64 Group Title
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    if your options are truely: 200,873 then its most likely a typo and prolly meant to be read as 200,837

    • one year ago
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