Physics · Oct / Nov 2022 · Paper 41 · Question 3
0625
As printed in the paper
The question as text
A rock climber, of total mass 62 kg, holds herself in horizontal equilibrium against a vertical cliff. She pulls on a rope that is fixed at the top of the cliff and presses her feet against the cliff. Fig. 3.1 shows her position. 0.90 m 1.2 m 60° centre of mass rope cliff rock climber Fig. 3.1 (not to scale)
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3(a)[1]
620 N
3(b)[2]
no resultant force (on object in equilibrium)
no resultant moment (on object in equilibrium)
3(c)(i)[2]
560 N m
( =) Fx┴r or 620 × 0.90
3(c)(ii)[3]
540 N
use of any moment
T × 1.2 sin 60° (= 560) or (T =) 560 / (1.2 × sin 60°)
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