TRY: In a two-dimensional tug of war, Alex, Betty and Charles pull an automobile tire at the angles shown in the overhead view of Fig. The tire remains stationary in spite of the three pulls. Alex pulls with force FA of magnitude 220N, and Charles pulls with force FC of magnitude 170N. Note that the direction of Charles' pull is not given. What is the magnitude of Bettys force FB? Alex Charles 137 deg Betty.

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