MMMU-Pro / test_Mechanical_Engineering_338 / The Iron Arms rotating forearm grips exercises the forearms by resisting…

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1. 1.27
2. 1.30
3. 1.05
4. 1.58
5. 1.35
6. 1.48
7. 1.40
8. 1.12
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10. 1.17

question

The Iron Arms rotating forearm grips exercises the forearms by resisting rotation of the handle grips inward and outward — see Figure P12.32 and Figures P2.2 and P2.3 (Chapter 2). The rotation of the gripped handle, about its center, is opposed by the force on the free end of the spring.The handle assembly is shaped like a 'D.' The curved portion of the D slides smoothly inside the hollow ring; the straight portion of the D is for hand gripping. The handle grip length is approximately 4.0 in. long and 1.25 in. in diameter. The rings have an outer diameter of 7.75 in.and an inner diameter of 5.375 in. The entire Iron Arms assembly has an overall length of 15.40 in., a width of 7.75 in. (outer ring diameter), and a thickness of 1.25 in. Each spring has squared ends with 29 total coils and is made of carbon steel wire. The mean coil diameter is .812 in., and the wire diameter, d = 0.088 in. The coil outer diameter is 0.90 in. The spring has a free length of 10.312 in., and a compressed length of 9.75 in. when assembled and in the 'starting position.'Select a carbon steel coil spring material and determine if the spring is designed for infinite life.<image 1>

subject

Mechanical_Engineering