How Do Equilibrium and Elasticity Determine Stress and Strain in a Steel Post?

AI Thread Summary
To determine the stress in a vertical solid steel post supporting an 8000 kg load, the stress can be calculated using the formula stress = force/area, where the area is derived from the post's diameter. The strain can be found using the formula strain = stress/modulus of elasticity, requiring knowledge of steel's elastic properties. The type of stress experienced by the post is tensile, as it is subjected to a vertical load. The final length of the post under load can be calculated using the original length and the strain. Understanding these concepts of equilibrium and elasticity is crucial for solving the problem accurately.
eureka360
Messages
9
Reaction score
0
hi guys... can you please help me with these problem?
it says... a vertical solid steel post 25 cm in diameter and 2.5 m long is required to support a load of 8000 kg. you can ignore the weight of the post... what is the stress in the post? what is the strain in the post? and what is the length when the load is applied?... what kind of stress is it? a bulk? of tensile? please somebody help me... thanks
 
Physics news on Phys.org
You're first going to have to show your thoughts on the problem... you might even need to know some constants relating to the steel... but you need to think about this; I'm not digging in my texts until you do.
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top