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FizziksGuy

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Posts posted by FizziksGuy

  1. Exactly .7 seconds after the ball is released, you don't (yet) know how far it has fallen.  You could solve for the displacement of the ball after 0.7 seconds, however.

     

    If, instead, the problem had asked "how fast is the ball traveling the instant before it hits the ground," in that case you would use 4.0 meters as the displacement, but you would not know t (elapsed time).

  2. Hi RegentsScholar06.  All of the content is still on the site, just in different places (in the Worksheets sections as well as the Community section, which wasn't available when the first book was published), and all of the videos are still available on the site, just not in Flash format, but more modern streaming formats (and also through YouTube).  Unfortunately I don't see as I'll have time to perform such a significant upgrade on the site in the near future to convert the manually-developed Flash content into HTML5, an extremely significant undertaking.

    All the Best,

    Dan

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  3. Hi Myua,

         It's in the download section -- the previous "buy" button turns to a "download" button after you complete the purchase.  To save you the trouble, however, I also e-mailed you the file.

  4. Connecting to ground provides an infinite supply of electrons (or can be an infinite sink of electrons).  If you ground a metal rod, and hold a negative rod near an end, negative charges will be repelled from the rod into the ground.  If you then disconnect the rod from the ground, no charges can enter or leave the rod, so you're left with a net positive charge on the rod.

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