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lgbasallote

  • 2 years ago

In 1990, walter arfeuille of belgium lifted a 281.5 kg object through a distance of 17.1 cm using only his teeth (a) how much work was done on the object by arfeuille in this lift, assuming the object was lifted at constant speed?

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  1. lgbasallote
    • 2 years ago
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    im thinking \[-\Delta U_{GRAV}?\]

  2. rajathsbhat
    • 2 years ago
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    Right-o!

  3. lgbasallote
    • 2 years ago
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    so \[\implies -(281.5)(9.8)(0-0.171)?\] i change this to meters right?

  4. rajathsbhat
    • 2 years ago
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    0.171 is in metres already. I don't get your question.

  5. rajathsbhat
    • 2 years ago
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    that multiplication is the answer though..

  6. lgbasallote
    • 2 years ago
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    the given was 17.1 i was confirming that i needed to change that to meters

  7. lgbasallote
    • 2 years ago
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    or do i use 17.1?

  8. rajathsbhat
    • 2 years ago
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    ah, yes, it is 0.171 that you need you need to use.

  9. lgbasallote
    • 2 years ago
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    ahh thanks

  10. CarlosGP
    • 2 years ago
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    His work was used to increase potential energy of the weight, therefore you can calculate like W=mgh=281.5x9.81x0.171 J I have heard that the work done later on by his dentist to fix his dentures was quite hard

  11. lgbasallote
    • 2 years ago
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    a follow up question was (b) What total force was exerted on arfeuille's teeth during the lift what does that mean?

  12. CarlosGP
    • 2 years ago
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    The forced exerted was exactly F=mg=281.5 x 9.81 Newtons

  13. rajathsbhat
    • 2 years ago
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    It means that a downward force equal to the weight he lifted will be exerted on his teeth (the contact point).

  14. rajathsbhat
    • 2 years ago
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    Btw, @CarlosGP, I saw a man on TV lift a 1000kgs (a ton) with his teeth. Jus sayin.

  15. CarlosGP
    • 2 years ago
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    I saw another one make the Statue of Liberty disappear! ;) Can you believe it?

  16. rajathsbhat
    • 2 years ago
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    but this was for real. It was on 'Superhuman' on the DISCOVERY CHANNEL!

  17. CarlosGP
    • 2 years ago
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    I have to see under which conditions was the test carried out. I am not too sure neck muscles can stand that force

  18. rajathsbhat
    • 2 years ago
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    I'll try to find a video..

  19. CarlosGP
    • 2 years ago
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    @rajathsbhat, I would appreciate it! Thanks!

  20. lgbasallote
    • 2 years ago
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    so for (b) it's just gravitational force?

  21. lgbasallote
    • 2 years ago
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    @rajathsbhat

  22. rajathsbhat
    • 2 years ago
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    yes. Sorry, I was busy searching for that vid.

  23. lgbasallote
    • 2 years ago
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    haha lol...

  24. rajathsbhat
    • 2 years ago
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    and yes, it is the gravitational force.

  25. lgbasallote
    • 2 years ago
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    thanks!!`

  26. rajathsbhat
    • 2 years ago
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    yw.

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