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Yep, those frictionless, perfectly limp and inextensible ropes can be
purchased from the Ideal Equipment Company Ltd.,
which also sells
frictionless planes, ideal gases, point particles, frictionless pulleys,
infinite heat sinks, perfectly emissive black bodies, and all the other
things you need to make those pesky demonstrations really work as the
textbook says they should. The massless version of these ropes cost more.
Catalog on request.