# Tension in the wire

• Jun 10th 2012, 09:36 PM
Clairvoyantski
Tension in the wire
A mass of 50 Kg is suspended from the top in of the pole that is inclined 40 degrees to the vertical. the end of the pole is supported by a wire that is making an angle of 75 degrees with the pole.
What is the tension in the wire?

http://img833.imageshack.us/img833/1038/diagramxf.png
• Jun 10th 2012, 11:55 PM
biffboy
Re: Tension in the wire
Quote:

Originally Posted by Clairvoyantski
A mass of 50 Kg is suspended from the top in of the pole that is inclined 40 degrees to the vertical. the end of the pole is supported by a wire that is making an angle of 75 degrees with the pole.
What is the tension in the wire?

http://img833.imageshack.us/img833/1038/diagramxf.png

Let length of pole = L
Taking moments about the foot of the pole T*Lsin75=50*Lsin40
• Jun 11th 2012, 01:11 AM
Clairvoyantski
Re: Tension in the wire
Can you elaborate?
• Jun 11th 2012, 03:17 AM
biffboy
Re: Tension in the wire
The moment of a force about a point is the product of the force and the perpendicular distance from the point to the line of the force. When a system is in equilibrium the sum of clockwise moments = the sum of anticlockwise moments
• Jun 13th 2012, 04:56 AM
Clairvoyantski
Re: Tension in the wire
What do I do next?
Thanks and Regards,
• Jun 13th 2012, 05:15 AM
skeeter
Re: Tension in the wire
... click on the sketch
• Jun 13th 2012, 05:19 AM
Clairvoyantski
Re: Tension in the wire
Yes, but then I dont know the value of L!
• Jun 13th 2012, 05:37 AM
skeeter
Re: Tension in the wire
Quote:

Originally Posted by Clairvoyantski
Yes, but then I dont know the value of L!

you don't need the value of L ... its value cancels out as it is a common factor on both sides of the equation.

LOOK at the equation on the sketch once again.