For the situation shown in figure, mark the correct options. (a) Angle of friction is \( \tan ^{...

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For the situation shown in figure, mark the correct options.
(a) Angle of friction is \( \tan ^{-1}(\mu) \)
(b) Angle of repose is \( \tan ^{-1}(\mu) \)
(c) At \( \theta=\tan ^{-1}(\mu) \), minimum force will be required to move the block
(d) Minimum force required to move the block is \( \frac{\mu M g}{\sqrt{1+\mu^{2}}} \).
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