[問題] 一個力學習題
這是課本的題目，
A block of mass M is pulled along a horizontal (Fig)
┌──┐ m
frictionless surface by a rope of mass m, as │M ╞══→ F
─┴──┴─────
shown in Fig. A horizontal force F acts on one end
of the rope.
(a) Show that the rope must sag, even if only by
an imperceptible amount. Then, assuming that the
sag is negligible, find --
(b) the acceleration of the rope and the block, --
(c) the force on the block from the rope, and --
(d) the tension in the rope at its midpoint.
看不懂(a)要show繩子會鬆弛(sag)，我不懂為什麼會鬆弛，這樣不就T=0嗎?
還是我誤解了題目的意思?
--
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