Physics · May / June 2021 · Paper 41 · Question 3
0625
As printed in the paper
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3(a)[2]
molecules (already very) close / touching
(repulsive) forces (very) large
3(b)(i)[3]
6.5 × 105 Pa
(p =) F / A in any form or 8800 / 0.016 or (Fair =)1.0 × 105 × 0.016
5.5 × 105 or 5.5 × 105 (+ 1.0 × 105) or (1600 + 8800) / 0.016
3(b)(ii)[2]
pressure due to (increased height of) oil in cylinder mentioned or pressure (in liquid) increases as depth increases to keep the upwards force constant or to lift the (extra) oil
or to counteract / oppose the increased pressure / force / weight of the oil
3(b)(iii)[1]
(initial) force has to be greater than 8800 N to start the motion
or the upwards force (just) balances the weight (so no movement) or piston / oil has weight or friction (between moving parts)
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