Problems 2-3. A box of mass M contains a length of string of negligible mass. Fr

Question

Problems 2-3. A box of mass M contains a length of string of negligible mass. Friction makes it difficult to pull the string though a tight hole in the side of the box. Initially, the box is at rest on a very slippery surface with a short length of string outside the box. You start to pull on the string with a force of constant magnitude F as shown in the figure below. A short time later you have pulled an additional length d of string out of the box and the box has moved as distance w. Problem 2. What is the speed of the box at that later time? F(w+d A. Fw B. 2F (w+d C. 2Fw 2Fd D.

Explanation / Answer

speed of box at leater time, sqr(2Fw/M)

by conservation of energy

heat lost is F(w+d)

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