A box at rest is in a state of equilibrium half way up on a ramp. The ramp has an incline of 42 degrees What is the force of static friction acting on the box if box has a gravitational force of 112 point 1 cap n ?

Because the box is at rest, the forces along the ramp balance. Static friction must equal the component of gravity pulling the box down the ramp: 112.1 N × sin(42°) ≈ 75 N. Therefore, the static friction force is 75 N, choice A.

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