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HPluckrose's profile
Helen Pluckrose
Helen Pluckrose
Helen Pluckrose
@HPluckrose

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Helen Pluckrose

@HPluckrose

Editor @AreoMagazine Secular, liberal humanist. Mother. Doglover. Writing book about epistemology & ethics on the academic left Helen.pluckrose@areomagazine.com

London.
areomagazine.com/author/hpluckr…
Joined August 2011

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    Helen Pluckrose‏ @HPluckrose 27 Nov 2017

    Hmm. We know that the mass of a spring is 0.25kg & the spring constant is 1 kN/m but we're being asked to factor in the extension and don't know what that means?

    12:07 PM - 27 Nov 2017
    • 2 Likes
    • (((ɹoqǝɹʇs ɹ ɔ))) Marty B
    5 replies 0 retweets 2 likes
      1. New conversation
      2. (((Christian JB)))  🐌‏ @christianjbdev 27 Nov 2017
        Replying to @HPluckrose

        Force is proportional to the extension of the spring, but in the opposite direction to the extension.

        2 replies 0 retweets 1 like
      3. Helen Pluckrose‏ @HPluckrose 27 Nov 2017
        Replying to @christianjbdev

        Thank you! But how do we find out what the extension is from the mass and the constant?

        1 reply 0 retweets 0 likes
      4. (((Christian JB)))  🐌‏ @christianjbdev 27 Nov 2017
        Replying to @HPluckrose

        Well, what's the problem? Mass hanging on a spring in equilibrium?

        2 replies 0 retweets 0 likes
      5. Helen Pluckrose‏ @HPluckrose 27 Nov 2017
        Replying to @christianjbdev

        Oh I can't get a screenshot of it on her laptop! She's been asked to work out an equation that requires knowing the mass, the constant and the extension but has only been given the first two.

        1 reply 0 retweets 0 likes
      6. (((Christian JB)))  🐌‏ @christianjbdev 27 Nov 2017
        Replying to @HPluckrose

        (((Christian JB)))  🐌 Retweeted (((Christian JB)))  🐌

        It's probably this problem.https://twitter.com/christianjbdev/status/935240875675979777 …

        (((Christian JB)))  🐌 added,

        (((Christian JB)))  🐌 @christianjbdev
        Replying to @christianjbdev @HPluckrose
        http://www.sparknotes.com/testprep/books/sat2/physics/chapter8section4.rhtml … pic.twitter.com/1wueRCp5lL
        2 replies 0 retweets 0 likes
      7. Helen Pluckrose‏ @HPluckrose 27 Nov 2017
        Replying to @christianjbdev

        OK, Thanks. I'll show her. See if it makes sense.

        1 reply 0 retweets 1 like
      8. Ben‏ @BristolBen 28 Nov 2017
        Replying to @HPluckrose @christianjbdev

        You could also transpose this into a problem in probability theory, by just making up an answer and then calculating the odds of it being correct. 👍

        1 reply 0 retweets 3 likes
      9. Helen Pluckrose‏ @HPluckrose 28 Nov 2017
        Replying to @BristolBen @christianjbdev

        Stop helping.

        2 replies 0 retweets 2 likes
      10. 2 more replies
      1. New conversation
      2. Sean‏ @BlackGriffin0 27 Nov 2017
        Replying to @HPluckrose

        Are they asking you to calculate its mass per unit length?

        1 reply 0 retweets 0 likes
      3. Helen Pluckrose‏ @HPluckrose 27 Nov 2017
        Replying to @BlackGriffin0

        There's an equation which requires her to know the mass, the spring constant and the extension but we don't have the information for the extension and assume we should be able to work it out from the other two.

        1 reply 0 retweets 0 likes
      4. Sean‏ @BlackGriffin0 27 Nov 2017
        Replying to @HPluckrose

        They either have to give you the extension, or they're asking you to calculate it using Hooke's law: F=-kx.

        1 reply 0 retweets 0 likes
      5. Helen Pluckrose‏ @HPluckrose 27 Nov 2017
        Replying to @BlackGriffin0

        But we don't have force. We just have mass and constant.

        1 reply 0 retweets 0 likes
      6. Sean‏ @BlackGriffin0 27 Nov 2017
        Replying to @HPluckrose

        Is it hanging vertically?

        1 reply 0 retweets 0 likes
      7. Helen Pluckrose‏ @HPluckrose 27 Nov 2017
        Replying to @BlackGriffin0

        It has been dropped and is compressed.

        1 reply 0 retweets 0 likes
      8. Sean‏ @BlackGriffin0 27 Nov 2017
        Replying to @HPluckrose

        What force is acting on the mass to cause the compression?

        1 reply 0 retweets 0 likes
      9. Sean‏ @BlackGriffin0 27 Nov 2017
        Replying to @BlackGriffin0 @HPluckrose

        Wait, there's a drop involved? Then you'll need to think about work and energy, not just F=-kx.

        0 replies 0 retweets 0 likes
      10. End of conversation
      1. New conversation
      2. FanofNUFC‏ @AustraliaToon1 27 Nov 2017
        Replying to @HPluckrose

        Hmmmm. Who can answer this @katie_s_ashford @sputniksteve ?

        1 reply 0 retweets 0 likes
      3. sputnik steve‏ @sputniksteve 27 Nov 2017
        Replying to @AustraliaToon1 @HPluckrose @katie_s_ashford

        I assume you come to me for a #Foucauldian perspective? Or even a general post-post-modernist one?

        2 replies 0 retweets 1 like
      4. FanofNUFC‏ @AustraliaToon1 27 Nov 2017
        Replying to @sputniksteve @HPluckrose @katie_s_ashford

        You may not know the answers, but you always know who'd know. Ps follow Helen.

        0 replies 0 retweets 1 like
      5. End of conversation
      1. KanStaandPijpen‏ @KanStaandPijpen 27 Nov 2017
        Replying to @HPluckrose

        Chop the spring up in infinitesimal slices, weight each of them with the total mass of all slices weighing down on them, and integrate the offset per slice over the slices.

        0 replies 0 retweets 0 likes
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