   Chapter 4.6, Problem 4.8QQ

Chapter
Section
Textbook Problem

Consider the two situations shown in Figure 4.30, in which there is no acceleration. In both cases the men pull with a force of magnitude F. Is the reading on the scale in part (i) of the figure (a) greater than, (b) less than, or (c) equal to the reading in part (ii)?

To determine
The reading on the scale.

Explanation

Force is mathematically expressed as the product of mass and acceleration. When the spring scale is attached to the wall, the rope held by the man has zero acceleration. Hence, no force acts on the part of the rope held by the man. The force that is measured on the scale is the tension on the rope.

Conclusion:

The magnitude of the force applied in part (ii) is the same as part (i). Since, the magnitude is same, the man holding the rope on the left side in part (ii) can be considered equivalent to the wall in part (i)...

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