Mass, length and time are all SI base quantities.
A wire hangs between two fixed points, as shown in Fig. 1.1. [Figure 1.1]
A child's swing is made by connecting a car tyre to the wire using a rope and a hook. The system is in equilibrium with the wire hanging at an angle of 17° to the horizontal. The tension in the wire is 150 N. Assume that the rope and hook have negligible weight. The wire has a cross-sectional area of 7.5mm² and is made of metal of Young modulus 2.1 x 10¹¹ Pa. The wire obeys Hooke's law.

Q: What topic does this question test?

This question tests Deformation of solids in A-Level Physics (syllabus code 9702). It is worth 8 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Oct/Nov 2018 examination, Paper 2 Variant 3 (9702_w18_qp_23.pdf).

Question

Mass, length and time are all SI base quantities.
A wire hangs between two fixed points, as shown in Fig. 1.1. [Figure 1.1]
A child's swing is made by connecting a car tyre to the wire using a rope and a hook. The system is in equilibrium with the wire hanging at an angle of 17° to the horizontal. The tension in the wire is 150 N. Assume that the rope and hook have negligible weight. The wire has a cross-sectional area of 7.5mm² and is made of metal of Young modulus 2.1 x 10¹¹ Pa. The wire obeys Hooke's law.

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