gc physics textbook chapter 6 problems (id: f12b1e7d2)

本题目来源于试卷: gc physics textbook chapter 6 problems，类别为 IB物理学

[问答题]
Recall from Chapter 4,)c7;+m4fu nojci ot l0 Example 4–14, tgy, ty i;y img2s8w8-ihat you can use a pulley and ropes to decrease the force needed ty,ig gis8yw-2yt i; 8mo raise a heavy load (see Fig. 6–34). But for every meter the load is raised, how much rope must be pulled up? Account for this, using energy concepts.

参考答案:
Assuming that there are no dissipative forces to consider, for every meter that the load is raised, two meters of rope must be pulled up.  This is due to the rope passing over the bottom pulley.  The work done by the person pulling must be equal to the work done on the piano.  Since the force on the piano is twice that exerted by the person pulling, and since work is force times distance, the person must exert their smaller force over twice the distance that the larger pulley force moves the piano.


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