What Is the Normal Stress in a Prismatic Bar Under Tension?

AI Thread Summary
To find the normal stress in a prismatic bar under tension, the formula used is stress equals force divided by area. In this case, a force of 100 N is applied to a bar with a cross-sectional area of 5 cm². The correct calculation involves converting the area to m², resulting in a stress of 20,000 Pa or 20 kPa. Confusion arose regarding unit conversions and whether the force should be doubled if the bar is supported in the middle. Clarification on the derived units of Pascal confirms they are indeed N/m².
Baumer8993
Messages
45
Reaction score
0

Homework Statement


In a prismatic bar (same cross sectional area throughout the entire length), the load applied to both ends is 100 N causing the member to be in tension. If the cross sectional area of the member is
5 cm2. What is the normal stress in the in kPa?


Homework Equations


stress = force / area


The Attempt at a Solution



I first tried without looking at the units, and got 20, which is wrong. I next tried converting everything to m2 to get the answer is pascals the convert to kPa. I got 200 for my second answer. What am I doing wrong? This seems like such a simple problem!
 
Physics news on Phys.org
What are the derived units of a Pascal? Are they N/m^2 or N/cm^2?
 
They are N/m^2. I used an online converter to check, so I confused about what I did wrong.
 
Is the bar supported in the middle? If so, should the force be 100 or 200 N?
How did you get 20?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

How do I calculate the factor of safety for a prismatic bar under tension?
Replies
1
Views
2K
Tensile stress in perforated steel plate
Replies
6
Views
2K
Torsion and stress on a beam question
Replies
9
Views
2K
Shear stress on surface of a bar
Replies
10
Views
4K
What will be stress in the unbalanced force situation
Replies
2
Views
2K
Stress and strain compound bar question
Replies
9
Views
7K
How Does Fusing Beams with Different Properties Affect Stress Distribution?
Replies
10
Views
3K
Calculate the total change in length of a brass bar
Replies
8
Views
5K
Engineering Crane at 45-degree angle supports load -- Find principal boom stresses
Replies
7
Views
2K
Engineering Maximum normal stress and shear stress
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top