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Q1. A 20 N horizontal force pushes a block weighing 4.9N against a vertical wall. The coefficient of static friction between the wall and the block is 0.56, and the coefficient of kinetic friction is 0.35. Assume that the block is not moving originally. In unit-vector notation (Fx i + Fy j), what is the force on the block from wall?

Q2. Two long, parallel wires are separated by a distance of 3.40. The force per unit length that each wire exerts on the other is 3.20×10-5, and the wires repel each other. The current in one wire is 0.6690.

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