Two rectangular blocks are stacked on a table. The upper block has a mass of 3.4

Question

Two rectangular blocks are stacked on a table. The upper block has a mass of 3.40 kg and the lower block has a mass of 38.6 kg. The coefficient of kinetic friction between the lower block and the table is 0.260. The coefficient of static friction between the blocks is 0.551. A string is attached to the lower block and an external force ?"F is applied horizontally, pulling on the string. If a force of magnitude 500N is applied, at what angle above the horizontal must it be directed in order for the upper block to remain stationary with respect to the lower block?

(Write, but do not solve, the new Newton's 2nd law equations for this problem.)

Explanation / Answer

F = 3.4 x 0.551 = 1.8734 N

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