A block with a weight of \( 4.0 \mathrm{~N} \) is at rest on a horizontal surface. A \( 1.0 \mat...

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A block with a weight of \( 4.0 \mathrm{~N} \) is at rest on a horizontal surface. A \( 1.0 \mathrm{~N} \) upward force is applied to the block by means of an attached vertical string. What are the (a) magnitude and (b) direction of the force of the block on the horizontal surface?
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