Physics (AS & A Level) · May / June 2016 · Paper 42 · Question 4
9702
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A metal block hangs vertically from one end of a spring. The other end of the spring is tied to a thread that passes over a pulley and is attached to a vibrator, as shown in Fig. 4.1. spring block pulley vibrator Fig. 4.1
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4(a)(i)[2]
T = 0.60 s and ω = 2π / T ω = 10 (10.47) rad s–1 [2]
4(a)(ii)[2]
energy = ½mω2x0 2 or ½mv2 and v = ωx0 = ½ × 120 × 10–3 × (10.5) 2 × (2.0 × 10–2) 2 = 2.6 × 10–3 J [2]
4(b)[3]
sketch: smooth curve in correct directions peak at f amplitude never zero and line extends from 0.7f to 1.3f [3]
4(c)[2]
sketch: peaked line always below a peaked line A peak not as sharp and at (or slightly less than) frequency of peak in line A [2]
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