ch06-p087 - 87. For simplicity, we denote the 70 angle as...

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87. For simplicity, we denote the 70° angle as θ and the magnitude of the push (80 N) as P . The vertical forces on the block are the downward normal force exerted on it by the ceiling, the downward pull of gravity (of magnitude mg ) and the vertical component of G P (which is upward with magnitude P sin ). Since there is no acceleration in the vertical
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