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A 3.6 m long steel wire has a cross-section area of 0.047 cm2. Its proportional limit has a value of 0.0015 times its Young's modulus (see table). Its breaking stress has a value of 0.0069 times its Young's modulus. The wire is fastened at its upper end and hangs vertically.
(a) How great a weight can be hung from the wire without exceeding the proportional limit? N
(b) How much will the wire stretch under this load? mm
(c) What is the maximum weight that the wire can support? N
What is the physics behind everyday sayings
Kelli weighs 417 N, and she is sitting on a playground swing that hangs 0.44 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. Imagine that air resistance is negligible.
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