175 sin 20
The way to remember this is to think of the box on a level floor.
Then the component parallel to the surface is obviously zero.
and sure enough sin 0 = 0
the normal component is the entire weight when the surface is level
and sure enough cos 0 = 1
A 175-N box is placed on an inclined plane that makes a 20.0° angle with the horizontal. Find the component of the weight force parallel to the plane's surface.
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