Physics (AS & A Level) · Feb / March 2023 · Paper 22 · Question 2
9702
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A motor uses a wire to raise a block, as illustrated in Fig. 2.1. motor wire block, weight 1.4 × 104 N Z Y X Fig. 2.1 (not to scale) The base of the block takes a time of 0.49 s to move vertically upwards from level X to level Y at a constant speed of 0.64 m s–1. During this time the wire has a strain of 0.0012. The wire is made of metal of Young modulus 2.2 × 1011 Pa and has a uniform cross-section. The block has a weight of 1.4 × 104 N. Assume that the weight of the wire is negligible.
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2(a)(i)[2]
2(a)(ii)[3]
2(b)[3]
2(c)[3]
2(d)[2]
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