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The components of vector A⃗ are Ax = + 3.90 and Ay = -4.00. What is the angle measured counterclockwise from the +x-axis to vector A⃗ ?

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Eric

  1. Tan A = Y/X = -4.0/3.90 = -1.02564.
    A = -45.7o = 45.7o CW from +x-axis. = 314.3o CCW from +x-axis.

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    Henry

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