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

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A block weighting \( \mathrm{W} \) is held against a vertical
\( \mathrm{P} \) wall by applying a horizontal force \( \mathrm{F} \). The minimum value of \( F \) needed to hold the block is : \( (\mu \) is coefficient of friction between wall \& block)
\( (1)W / \mu \) \( (3)W / \mu \)
(2) \( =\mathrm{W} / \mu \)
(4) \( \llW / \mu \)
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