gc physics textbook chapter 4 problems (id: 5ebd37c18)

本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 IB物理学

[问答题]
If the coefficient of kinet;. hzf 0sa/x et3*di.ix:l ,lgz(qyqrp)-ne5jzy*yea.e t:dic friction between a 35$-\mathrm{kg}$ crate and the floor is 0.30 , what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if $\mu_{\mathrm{k}}$ is zero?

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