Help with Statics Problem | Shaun

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In summary, the conversation is about solving a physics problem involving static equilibrium. The problem has three unknowns and can be solved using three equations. The person seeking help has tried various options but is still stuck and asks for assistance. The expert suggests starting with the torque equation and checking the calculations. In the end, it is revealed that the person made a mistake in calculating the weight of the beam and thanks the expert for their help.
  • #1
spatel600
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Please help with this problem:

http://labphysics.uncc.edu/Phys2101/001/Test3A-001-F94.html
#4

Please any help would be greatly appreciated.
AOL SN: spatel600

Please let me know. Thanks. Shaun
 
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  • #2
This is a straightforward problem in static equilbrium. You have three unknowns, but you can write three equations:
(1) Sum of the vertical components of forces = 0
(2) Sum of the horizontal components of forces = 0
(3) Sum of torques about any axis = 0

Give it a try.
 
  • #3
I tried that and I got Fx= Tcos() Fy = Fv + Tsin () = mg

Torque = : Lsin (150) T = L/2 (sin 90) mg

I have tried all options and I have been stuck for many hours now. I don't understand. Please help. Thanks
 
  • #4
Assuming you are using the correct angles, this looks OK to me. What's the problem?

Start with the torque equation. That will allow you to find T. Then use that to find the rest.
 
  • #5
The numbers do not seem to be right. Everytime I put the answers in the practice test they are incorrect. Give it a try, maybe the teacher made a mistake.
 
  • #6
spatel600 said:
The numbers do not seem to be right. Everytime I put the answers in the practice test they are incorrect.
Tell me your answers and I'll check them out.
 
  • #7
My numbers were T= 980 which is 490/sin (150)
Fh = 848.71 which is T cos (30)
Fv = 490 which is mg-Tsin(30)
 
  • #8
spatel600 said:
My numbers were T= 980 which is 490/sin (150)
Fh = 848.71 which is T cos (30)
Fv = 490 which is mg-Tsin(30)
What units are you using for force?

I'll bet I can guess what you're doing wrong: you are calculating mg as 100x9.8 = 980, right?

If so... oops. The weight of the beam is given as 100 lbs; that means mg = 100 lbs.
 
  • #9
hahah thanks so much. I can't believe i made that stupid mistake. I really appreiciate all you help. Thanks. Shaun
 

FAQ: Help with Statics Problem | Shaun

What is a statics problem?

A statics problem is a problem in mechanics that involves analyzing forces acting on a stationary object. It is often used to determine the equilibrium of a system and the resulting reactions and forces.

Why is statics important in science?

Statics is important in science because it helps us understand the forces that act on objects and how they affect their motion. It is the basis for many engineering and physics principles and is used in various fields such as architecture, aerospace, and materials science.

How do I solve a statics problem?

To solve a statics problem, you need to first identify all the forces acting on the object and their directions. Then, use Newton's first and second laws to determine the resulting forces and their equilibrium. Finally, use mathematical equations and principles such as equilibrium equations and free-body diagrams to solve for the unknowns.

What are some common mistakes when solving statics problems?

Some common mistakes when solving statics problems include not considering all the forces acting on the object, not using the correct force equations, and not setting up the free-body diagram accurately. It is important to double-check all the steps and equations used to avoid these mistakes.

How can I improve my understanding of statics?

To improve your understanding of statics, you can practice solving different types of statics problems and familiarize yourself with the relevant equations and principles. You can also seek help from teachers, tutors, or online resources to clarify any doubts and reinforce your understanding.

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