A cat climbs up the side of a tree, tilted at a 10 degree angle relative to the vertical (the cat is on the top side). The cat's claws dig into the tree bark, which pushes the cat up the tree.  If the cat has a mass of 5 kg, how hard does it have to push into the tree in order to climb up at constant speed?

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10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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A cat climbs up the side of a tree, tilted at a 10 degree angle relative to the vertical (the cat is on the top side). The cat's claws dig into the tree bark, which pushes the cat up the tree. 

If the cat has a mass of 5 kg, how hard does it have to push into the tree in order to climb up at constant speed? 

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