Understanding the Calculation for Shear Stress of Water

AI Thread Summary
The discussion centers on a homework question regarding the calculation of shear stress in water, specifically questioning why dy is represented as 0.005/2 instead of 0.005. Participants express confusion over this notation, suggesting it may be a mistake. There is also a mention of a potential error in terminology, where "acceleration" is incorrectly used instead of "velocity." The consensus leans towards the belief that dy should indeed be 0.005. Clarity on these points is essential for accurate understanding of the shear stress calculation.
goldfish9776
Messages
310
Reaction score
1

Homework Statement


for the second photo , why the dy is 0.005/2 ? why not 0.005 ?

Homework Equations

The Attempt at a Solution

 

Attachments

  • 2567.PNG
    2567.PNG
    85.7 KB · Views: 427
  • 2566.PNG
    2566.PNG
    13.4 KB · Views: 383
Physics news on Phys.org
Looks like a mistake to me. Also, it says acceleration where it means velocity.
 
haruspex said:
Looks like a mistake to me. Also, it says acceleration where it means velocity.
In your opinion , it should be 0.005 ?
 
goldfish9776 said:
In your opinion , it should be 0.005 ?
Yes.
 
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 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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