A smaller 18 kg box is held up against a larger 52 kg box


A smaller 18 kg box is held up against a larger 52 kg box as shown. The coefficients of friction are Mu s = 0.54 and Mu k = 0.22 between the two boxes. There is no friction on the floor! Thus the big box will begin to slide as soon as it is pushed on.

What minimum force must be exerted so that the smaller box is held against the larger box without slipping?

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Physics: A smaller 18 kg box is held up against a larger 52 kg box
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