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The illustrated belt is made of rubber (E= = 4 MPa) and has a thickness of 4 mm. It passes through a pulley whose diameter is 20 cm. The belt is subjected to a tension of 50 N. What must be the minimum width, L, so that the stress does not exceed 200 kPa?

Answer: 10.3 cm

Figure 7.2
50 N
50 N

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