Posted by **Leo** on Tuesday, March 6, 2012 at 11:43pm.

Two horizontal forces F1 and F2 act on a 1.7 kg disk that slides over frictionless ice, on which an xy coordinate system is laid out. Force F1 is in the negative direction of the x axis and has a magnitude of 3.0 N. Force F2 has a magnitude of 9.0 N. What is the angle between the constant directions of forces F1 and F2?

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