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In the figure shoen calculate the angle ...


In the figure shoen calculate the angle of friction . The block dows not slide. Take `g=10(m)/(s^2)`.

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`R=mg+60=160N`
`f=80N` (No sliding)
angle of friction `theta=tan^-1(f)/®=tan^-1(80)/(160)`
`theta=tan^-1(1)/(2)`
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