Posted by **Lalo** on Friday, February 19, 2010 at 7:02am.

A horizontal clothesline is tied between 2 poles, 20 meters apart.

When a mass of 5 kilograms is tied to the middle of the clothesline, it sags a distance of 4 meters.

What is the magnitude of the tension on the ends of the clothesline?

- Vector Calculus -
**Damon**, Friday, February 19, 2010 at 7:14am
Requires algebra, trigonometry and physics, not calculus.

Total force down = total force up since the mass does not accelerate

Do half the problem at a time since it is symmetrical

So 2.5 kg down on left gives 2.5*9.8 = 24.5 Newtons down.

That 24.5 Newtons must be supported by the vertical component of the tension in the line on the left.

So T (4/sqrt (4^2+10^2) = 24.5

T = 24.5 (sqrt 116)/4 = 66 Newtons

If this is a mathematics rather than a physics question they may express force in kilograms (mathematicians do stuff like that) in which case divide by g which is about 9.8 m/s^2

- Vector Calculus -
**kumar**, Tuesday, August 31, 2010 at 9:29pm
T 4/sqrt (4^2+10^2) DOES NOT EQUAL 24.5

- Vector Calculus -
**kumar**, Tuesday, August 31, 2010 at 9:30pm
ignore my last comment i'm an idiot

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