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匿名 發問於 科學及數學物理學 · 2 月前

兩條Physics 問題 (答岩比5星)!?

1) A 63 kg hiker is dangling over the edge of an icy cliff. His partner (80 kg) is standing on icy ground holding a rope to keep the dangling hiker from falling. What coefficient of friction is needed to keep them from sliding?

2) Find the change in length of a spring with constant 750 N/m if it is used to pull a 75 kg gold bar across a surface (at a constant velocity) with a coefficient of friction of 0.45.

please answer with steps!! thx very much

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