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April 29, 2024, 01:48:17 pm
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Author Topic: Torque Question!! :D  (Read 629 times)  Share 

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Allygator

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Torque Question!! :D
« on: June 02, 2011, 08:18:24 pm »
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http://img710.imageshack.us/img710/8046/screenshot20110602at818.png
I have no idea how to solve this problem! Anyone care to help?
Thanks in advance :D
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onur369

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Re: Torque Question!! :D
« Reply #1 on: June 02, 2011, 08:23:00 pm »
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Is the answer 288675 N ? If so Ill post up a solution
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Allygator

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Re: Torque Question!! :D
« Reply #2 on: June 02, 2011, 08:26:20 pm »
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nah it's 1.4*10^5 N...    ???
thanks for attempting it though!
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onur369

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Re: Torque Question!! :D
« Reply #3 on: June 02, 2011, 08:31:28 pm »
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Which trial is this from ?
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dopplereffect

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Re: Torque Question!! :D
« Reply #4 on: June 02, 2011, 08:42:05 pm »
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Consider the wires as one, lemme see if I can find my working out.

EDIT: Actually assume that the weight is spread evenly between both.
« Last Edit: June 02, 2011, 08:45:13 pm by dopplereffect »
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Plan-B

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Re: Torque Question!! :D
« Reply #5 on: June 02, 2011, 08:42:22 pm »
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First find the length of the plank using trig.
L=16*cos(60)
Which we get 8m.

As it weighs 50 tons, weight force of roof equals = 50 * 1000 * 10 = 500000 N

But there are two cables, hence it shares half of the the force to keep in equilibrium. Thus, one cable has to handle a weight force of 250000N.
Take pivot point at the base.

Anti clockwise torque = Clockwise torque
Weight force down * length (take length at centre of mass) = force up * length (cable acts at the end)
therefore, 250000N * 4m = Force up * 8m
therefore, Force up = 125000 N

Use trig to find tension now.
Force Tension in cable = 125000/sin(60) = 144337 N = 1.4 * 10^5 N

Sorry, it's a little bit hard to understand without a diagram. But i'm pretty sure that's how it's done.
                    
« Last Edit: June 02, 2011, 08:46:03 pm by Plan-B »
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Allygator

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Re: Torque Question!! :D
« Reply #6 on: June 02, 2011, 08:50:24 pm »
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Awesome!! i get it now :D
 thanks very much
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dopplereffect

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Re: Torque Question!! :D
« Reply #7 on: June 02, 2011, 08:50:45 pm »
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That's how you do it lol. I did it but forgot how to do it again. :S
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