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小 發表於 2016-1-23 03:27 PM (第 3008 天)
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horizontal component of R balances T cos 12 (points to the right).
Take moments about where T acts upon.
clockwise moment by L = (40)(0.24) = 9.6 N m
anti-clockwise moment by W = (520)(0.03) = 15.6 N m
This means that the vertical component of R has to produce a clockwise moment of (15.6 - 9.6) = 6 N m about where T acts upon. Hence the vertical component of R point upwards.
[ 本帖最後由 abcb_007 於 2016-1-23 03:29 PM 編輯 ]