Question

Orlinary windew shade rolln İNve long torion springs thet work on dhe same principle s theOverhend garage door support of Problem 12.59. For a roler of 3-mm diameter, how many

kurnsof 1.2-m square steel wiR with D= 19 mm would be required to give a shade pul fune of14N with the spring wound up 14 turns? What would be the valne of maximom bending stress inthe spring?

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