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Urgent physics moments Q help

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I've attempted many times and looked at mark scheme ( off specimen paper edexcel and does not really give a good interpretation of the working) please somebody help? I just don't get what distances to measure from which point and thus I keep getting the wrong answer.

Sorry for poor quality photo (it's part A i am looking for help to do)

(edited 7 years ago)

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Reply 1

Joinedup

XP is the distance between points X and P
JP is the distance between points J and P
F_J is the muscle force applied at J
F_X is the bite force at point X

rough answer would be XP F_X = JP F_J

could be improved by resolving F_J using some trig as it's not perpendicular to the line Y... which they may expect for 5 marks.

Reply 2

TomA90

Original post by Joinedup

XP is the distance between points X and P
JP is the distance between points J and P
F_J is the muscle force applied at J
F_X is the bite force at point
rough answer would be XP F_X = JP F_J

could be improved by resolving F_J using some trig as it's not perpendicular to the line Y... which they may expect for 5 marks.