http://darnley.livejournal.com/ ([identity profile] darnley.livejournal.com) wrote in [personal profile] allocco 2012-11-30 06:12 pm (UTC)

Казалось бы, вот эта сила трения (со стороны бруска на стол) совершила работу Fd, которая и ушла в тепло.
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