Physics (AS & A Level) · Oct / Nov 2016 · Paper 22 · Question 3
9702
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3(a)[2]
resultant force (in any direction) is zero resultant moment/torque (about any point) is zero [2]
3(b)(i)[1]
force = 33 sin 52° or 33 cos 38° = 26 N [1]
3(b)(ii)[3]
26 × 0.30 or W × 0.20 or 12 × 0.40 26 × 0.30 = (W × 0.20) + (12 × 0.40) W = 15 N [3]
3(c)(i)[2]
E = ∆σ / ∆ε or E = σ / ε ∆σ = 2.0 × 1011 × 7.5 × 10–4 = 1.5 × 108 Pa [2]
3(c)(ii)[3]
∆σ = ∆F / A or σ = F / A A = 78 / 1.5 × 108 (= 5.2 × 10–7 m2) 5.2 × 10–7 = πd 2 / 4 d = 8.1 × 10–4 m [3]
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