A-LevelPhysicsDeformation of solidsMay/June 2015Paper 1 Q231 Mark
The diagram represents a steel tube with wall thickness w which is small in comparison with the diameter of the tube. [Figure showing a tube under tension T, with wall thickness w.] The tube is under tension, caused by a force T, parallel to the axis of the tube. To reduce the stress in the material of the tube, it is proposed to thicken the wall. The tube diameter and the tension being constant, which wall thickness gives half the stress?
Aw/2
B√2 w
C2w
D4w
✓ Correct Answer
The correct answer is C: 2w
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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