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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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 Spring '08
 Any
 Physics, Force, Gravity

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