2011年4月3日 · r1, r2, rm, x1,x2,xm, turns ratio, V1 Homework Equations R1 = r1' + r2' X1 = x1 + x2' = x1 +x2(N2/N1) The Attempt at a Solution Using the equations above I have found R1 and X1 I now need to find rm and xm of the approximate equivalent circuit and primary current , primary power factor, primary real power, secondary voltage.

2015年2月18日 · Let U={(x,y) in R2:x2+y2<4}, and let f(x,y)=√.(4−x2−y2) Prove that f is differentiable, and find its derivative. I do know how to prove it is differentiable at a specific point in R2, but I could not generalize it to prove it differentiable on R2.

2012年11月22日 · Homework Statement Mass M is distributed uniformly over a disk of radius a. Find the gravitational force between this disk-shaped mass and a particle with mass m located a distance x above the center of the disk. Homework Equations The problem gives the hint to use the equation found in...

2008年9月21日 · T: R^2-->R2 first rotates points through -3pi/4 radian clockwise and then reflects points through the horizontal x1-axis. Find the standard matrix of T. Homework Equations-The Attempt at a Solution Vector 1 is: (-1sqrt2 - 1 sqrt2) before the reflection, and after the reflection it is: (-1 sqrt 2 1 sqrt 2) This I knew since we can use: (cos ...

2017年6月30日 · Maintaining R as the constant hypotenuse in the triangle formed by x and y coordinates in a 'perfect' circle, r2=x2+y2 r2=x2+y2 So knowing that in 9.8 metres above ground it will take 1 second for an object to fall, I tried to find how many metres in the X direction an object must cover in 1...

2013年2月10日 · So let A=(3x2,x2) T and B=(3v2,v2) T is what the right side is saying now I am going to to check to make sure they follow the two rules. A is closed under scalar multiplication because (3(β)(x2),βx2) T Lies in the set, and is simply just a scalar multiple. if I add A+B I get (3(x2+v2),(x2+v2)) T Which is closed under scalar addition.

2010年7月4日 · So, I have to prove that in the metric space (R^n, d), where d is the standard Euclidean metric, B(x1, r1) = B(x2, r2) x1 = x2 & r1 = r2. I finished the proof, but I'm not sure about one step. Assume B(x1, r1) = B(x2, r2) with x1 = x2. Using the triangle inequality for x1, x …

2010年3月24日 · Homework Statement Bounded by the cylinders x2 + y2 = r2 and y2 + z2 = r2 We're supposed to stick to double integrals as triple integrals are taught in a later section. The Attempt at a Solution Edit: Alright, I think I go to the right answer. x = sqrt(r2 - y2) z = sqrt(r[SUP2[/SUP] - y2)...

2005年9月8日 · 40. If r = <x,y>, r1 = <x1,y1>, and r2 = <x2,y2>, describe the set of all points (x,y) such that |r - r1| + |r - r2| = k, where k > |r1-r2| I'm completely lost on this one. 43. Use vectors to prove that the line joining the midpoints of two sides of a traingle is parallel to the third side and half its length. I'm also confused on how to do ...

2009年3月22日 · Determine whether the following are linear transformations from R2 into R3: Homework Equations a) L(x)=(x1, x2, 1)^t b) L(x)=(x1, x2, x1+2x2)^t c) L(x)=(x1, 0, 0)^t d) L(x)=(x1, x2, x1^2+x2^2)^t The Attempt at a Solution To show L is a linear transformation, I need to be able to show: 1. L(a*x1+b*x2)=aL(x1)+bL(x2); 2. L(x1+x2)=L(x1)+L(x2); 3. L ...