Physics (AS & A Level) · Oct / Nov 2025 · Paper 14 · Question 20
A cylindrical steel rod with negligible weight has a diameter of 1.5 cm and a length of 5.2 cm. The rod is firmly attached at the top end. The rod is firmly attached to a machine at the other end that applies a constant force of 363 N to the rod. This causes the rod to extend to a length of 7.4 cm and to have a minimum diameter of 0.60 cm in the position shown. What is the maximum stress acting on the steel rod when the length is 7.4 cm?
- A2.1 \times 10^6\, Pa
- B3.2 \times 10^6\, Pa
- C5.7 \times 10^6\, Pa
- D1.3 \times 10^7\, Pa
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Correct answer: D. 1.3 \times 10^7\, Pa
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