Tension and weight

1. Jun 7, 2005

chynawok

I looked in the physics book and couldn't find any similar examples. Maybe someone can tell me how to go about this problem:

A picture it hanging on a nail. The tension in each string segment which is holding up the picture is 3.5 N. The string forms a 45 degree angle on the two top corners of the picture frame.

a) What is the equilibrant or the upward reaction force of the nail?
b) What is the weight of the picture?

This is how I started going about it:
T1 + T2 + W = 0
Tsin45 + Tsin 45 - W = 0
2Tsin45 = W
2(3.5)sin45 = W = 4.9 N

Any pointers?
Thanks

Last edited: Jun 7, 2005
2. Jun 7, 2005

FredGarvin

Is it 40° or 45°?

3. Jun 7, 2005

chynawok

oops. typo- it's 45 degrees.

4. Jun 8, 2005

FredGarvin

What does your free body diagram look like? Since the nail is the only item that is holding the picture up, you are correct with saying that the weight of the picture and the reaction force at the nail are equivilent.

Last edited: Jun 8, 2005