Algebra Help for Bernoulli's Equation

AI Thread Summary
To solve for v1 in the equation P1 + (1/2)ρv1^2 = P2 + (1/2)(v1r1^s/r2^2)^2, the key is to recognize that both sides contain v1 terms. By rearranging the equation, you can isolate the terms involving v1 and factor them out. This leads to a simplified expression where you can solve for v1 more easily. The discussion highlights the importance of correctly identifying and managing the powers of v1 on both sides of the equation. Ultimately, factoring out common elements will allow for a clearer path to finding v1.
NRasmus1
Messages
8
Reaction score
0
Solve for v1

P1 + (1/2)ρv1^2 = P2 + (1/2)(v1r1^s/r2^2)^2

I am attempting to solve this equation for v1, but I am getting stuck on some algebra. How do I solve for v1? I can't figure out how to do it without eliminating v1 altogether because I have a v1^2 on both sides of the equation.
 
Last edited:
Physics news on Phys.org
No on the left you have v1^s and on the right you v1^2 so you still have v1 around to solve for.
 
I just caught that! I had intended v1^s on the left side to be v1^2
 
so you're going to get something like

(P1 - P2)

= (1/2v1^2 * r1^2 / r2^2 - 1/2 * p * v1^2)

right?

so then factor out 1/2 and v1^2 then solve for v1
 
I feel like a moron. Thank you very much.
 
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