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M1 question on moments

https://3b0a7b1bc87f5381e60f8f717510b7e3072e9617.googledrive.com/host/0B1ZiqBksUHNYcEVTUFdwYmtsb2c/June%202014%20(R)%20QP%20-%20M1%20Edexcel.pdf

for 6c)of this question,how do you work out k? Please give simple explanation only as it will confuse me even more. Thanks

Reply 1

nerak99

Try to provide what you have attempted. There is a weight where the string at b is under zero tension. This is the maximum value of k. Any k lower than this will mean that both strings are taking some weight rather than the rod pivoting about c.

Reply 2

coconut64

Original post by nerak99

HI, this is what I did. Please could you show me a diagram for the explanation? Thanks.

Reply 3

nerak99

Your diagram is fine although I would have neglected using 'N' in the labels as I think that the N confuses things as it looks like a variable.

My calculation is different though