
One of the problems posed by the Marquis de l’Hospital in his calculus textbook Analyse des Infiniment Petits concerns a pulley that is attached to the ceiling of a room at a point C by a rope of length r. At another point B on the ceiling, at a distance d from C (where d > r), a rope of length ℓ is attached and passed through the pulley at F and connected to a weight W. The weight is released and comes to rest at its equilibrium position D. (See the figure,) As l’Hospital argued, this happens when the distance |ED| is maximized. Show that when the system reaches equilibrium, the value of x is
Notice that this expression is independent of both W and ℓ.
FIGURE FOR PROBLEM 21

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Chapter 3 Solutions
Single Variable Calculus
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