Homework Help: PHYSICS

Posted by Ann on Monday, November 29, 2010 at 7:04pm.

1)A picture of width 40 cm weighing 40N hangs from a nail by means of flexible wire attached to the sides of the picture frame. The midpoint of the wire passes over the nail which is 3 cm higher than the points where the wire is attached to the frame. Find the tension of the wire.

PHYSICS - bobpursley, Monday, November 29, 2010 at 7:11pm
the wire on each side supports mg/2

Looking at the force diagram, sinTheta(angle of depression)=(mg/2)/Tension

but tanTheta=3/20 according to the dimensions.

Tension= 20/sinTheta= 20 /sin(arctan.15)
PHYSICS - Ann, Monday, November 29, 2010 at 7:39pm
Thank YOu!

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