Homework Help: PHYSICS

Posted by Anonymous on Monday, June 25, 2012 at 6:47pm.

3 FORCES ACT ON MOVING OBJECT.FIRST FORCE HAS MAGNITUDE OF 80.0N AND DIRECTED DUE NORTH.ANOTHER HAS MAGNITUDE 60.0N AND DIRECTED DUE WEST.WHAT IS THE MAGNITUDE AND DIRECTION OF THIRD FORCE,SUCH THAT THE OBJECT MOVE IN CONSTANT VELOCITY?

PHYSICS - Henry, Tuesday, June 26, 2012 at 12:37pm
F2+F1 = -60 + i80.
F2 + F1 + F3 = 0
-60 + i80 + F3 = 0
F3 = 60 - i80
tanAr = -80/60 = -1.333333
Ar = -53.13 = Reference angle.
A = -53.13 + 360 = 306.87 Deg.
F3 = 60 - i80 = 60 / cos306.87 = 100N. @ 306.87 Deg.

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