A 50 kg trekker wants to drag a 200 kg sled over snow she, Ask an Expert

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A 50 kg trekker wants to drag a 200 kg sled over snow. She does this by tying a rope to the sled (at ground level) and running it over her shoulder. The rope running between her and the sled makes a 45 degree angle with the horizontal. If the coefficient of friction between the sled and the snow is 0.1, what must the coefficient of friction between her shoes and the ground be for her to move the sled?

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