Posted by Amanda on Wednesday, December 19, 2012 at 9:29pm.
parallel plane: mgsin(39.5) - .330N = ma
perpendicular plane: N - mgcos(39.5) = 0 <== because it is not accelerating perpendicular the plane
so N = mgcos(39.5)
therefore, parallel plane: mgsin(39.5) - .330(mgcos(39.5)) = ma
m's cancel: gsin(39.5) - .33gcos(39.5) = a
a = 3.74 m/s^2
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