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1. ### Surface area in multivariable calculus?

r = 10uv i - v j + u k A = ∫∫ dS = ∫∫ || ∂ r /∂u x ∂ r /∂ v || dA ... ∂ r /∂u = {10v,0,1} ... ∂ r /∂ v = {10u,-1,0} ... || ∂ r /∂u x ∂ r /∂ v || = √(100(u² + v²) + 1) = ∫∫ √(100(u² + v²) + 1) du...

1 Answers · Science & Mathematics · 14/12/2010

2. ### For the Ohm's law equations, does I = J ?

No. " I " is usually short for electric "current". " J " is usually the square root of negative 1.  Correction...

1 Answers · Science & Mathematics · 28/10/2009

3. ### Find an equation of the tangent plane to the given parametric surface at the specified point.?

...1>. So, a normal n to the surface is n = r _u x r _ v = <sin v , -cos v , u>. At (u, v ) = (9, π... (√(3)/2)(x - 9/2) + (-1/2)(y - 9√(3)/2) + 9(z - π/3) = 0. I hope this helps!

1 Answers · Science & Mathematics · 22/07/2015

4. ### Surface Integral Homework?

r (u, v ) = ucos( v ) i + usin( v ) j + v k r _u = <cosv, sinv, 0> r _ v = <...sqrt(1+u^2) sqrt(1+u^2) dvdu = double int 1+u^2 dvdu, v = 0 to 5π, u=0 to 2 = 5π int 1+u^2 du = 5π(u+1...

2 Answers · Education & Reference · 29/04/2013

5. ### Evaluate the surface integral of sqrt(1 + x^2 + y^2)...?

... v , u sin v , v ), r _u x r _ v = (sin v , -cos v , u) ==> || r _u x r _ v || = sqrt(1 + u^2). So, ∫∫ F dS = ∫(u = 0 to...π) (1 + u^2) dv du = π(u + u^3/3) {for u = 0 to 5} = 140π/3. I hope this helps!

1 Answers · Science & Mathematics · 13/08/2010

6. ### Can someone help me with my Calc homework, please!?

... v = (1 - 4sin4t) i + 4(cos4t - 1) j + (1 - t²/2) k v = dr/dt, so integrating again r = ∫ [(1 - 4sin4t) i + 4(cos4t - 1) j + (1 - t²/2) k]dt r = (t + cos4t) i + (sin4t - 4t) j + (t - ...

1 Answers · Science & Mathematics · 20/09/2009

7. ### Divergence and Curl?

V = M i + N j + R k the formulas are: div V = Mx + Ny + ...

1 Answers · Science & Mathematics · 04/04/2008

8. ### does an talking interface as J .A. R . V . I .S. exist?

...letter straight into a WP and convert it into text that I 've ever heard of. And if there ...etc). You must do that also on a Mac. ( I use the 'esc' key as it is on a corner...

2 Answers · Computers & Internet · 13/05/2010

9. ### Evaluate ∫∫S sqrt(1+x^2+y^2) dS where S is the helicoid: r (u, v )=ucos( v ) i +usin( v ) j +vk, with 0≤u≤2,0≤ v ≤1π?

...1 + (u cos v )² + (u sin v )²)) * || r _u x r _ v || dA = ∫(u = 0 to 2) ∫( v = 0 to π) √(1 + u²...) du = π(u + u³/3) {for u = 0 to 2} = 14π/3. I hope this helps!

1 Answers · Science & Mathematics · 02/05/2017

10. ### Use the given acceleration function to find the velocity and position vectors. Then find the position at t = 2

... v (0) = (-sin 0) i + (cos 0) j + Ck = j + k C =1 So, v (t) = (-sin t) i + (cos t) j + k r (t) = (cos t) i + (sin t) j + tk r (0) = (cos 0) i + (sin 0) j + 0k = i r (2...

1 Answers · Science & Mathematics · 07/03/2008