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M1 Moments query

Taken from M1_Q3_Edexcel_June18
Party (a) no problem, but part (b) I appear to be missing something in my understanding See attachment.
If a Gymnast stands at point B then why is the Tension at point C zero?
From mark scheme: (M0 if TC is never equated to 0)
M1_Q3_Edexcel_June18.jpg334.9KB
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mqb2766
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Original post by xlaser31
Taken from M1_Q3_Edexcel_June18
Party (a) no problem, but part (b) I appear to be missing something in my understanding See attachment.
If a Gymnast stands at point B then why is the Tension at point C zero?
From mark scheme: (M0 if TC is never equated to 0)


If its the largest weight at B, then this will occur when it also generates the largest possible clockwise moment about D. As the tension at C also provides a clockwise moment, you want to minimize this, while remaining in equilibrium. So the tension at C will be 0 and the weight at B will then be maximum and still in equilbirum.

The tension in D will then be the sum of the two weights by resolving vertically
(edited 2 years ago)

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