A block weighting \( \mathrm{W} \) is held against a vertical \( \m...

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A block weighting \( \mathrm{W} \) is held against a vertical
\( \mathrm{P} \) wall by applying a horizontal force \( F \). The

W minimum value of \( F \) needed to hold the block is : \( \mu \) is coefficient of friction between wall \& block)
(1) \( W / \mu \)
(2) \( =W / \mu \)
(3) \( \mathrm{W} / \mu \)
(4) \( \llW / \mu \)
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