正合方程式的問題（工數） 有點毫無頭緒😵‍💫 求解

Section 1.3 Problems 測試是否為正合 In each of Problems 1-5, test the differential equation for exactness. If it is exact in some region R of the plane, find a potential function and a general solution, perhaps implicitly defined, that is valid for that region. If it is not exact on any region, do not attempt a solution. 1. 2y² + yexy + (4xy + xexy + 2y)y' = 0 2. 4xy + 2x + (2x² + 3y²)y' = 0 3. 4xy + 2x²y + (2x² + 3y²)y' = 0 4.2 cos(x+y) - 2x sin(x + y) - 2x sin(x + y)y' = 0 tlsx9 ² +y+ (3y² + x)y' = 0 5.

小弟不才，有人會這兩大題嗎🥲

(1) 有一部 460V、20hp、60Hz、6極三相感應電動機滿載運轉,當滑差率+3%時,試求出: (a)馬達轉速、(b)轉子頻率、(c)定子旋轉磁場轉速、(d)氣隙磁場轉速、(e)轉子磁場轉速相 對於轉子轉速、(f)轉子磁場轉速相對於定子及(g)定子旋轉磁場相對於轉子磁場轉速。 (2) 有一部 208V、60Hz、20hp、4極三相感應電動機,其 IEEE 等效電路參數如下: R = 0.120; R2 = 0.10; X = Xi = 0.250; Xm = 10.02 當該感應電機旋轉損失為400W 且滑差率5%時,試求出: (a)馬達轉速、(b)馬達電流、(c)定子銅損、(d)氣隙功率、(e)轉子銅損、(f)軸功率、(g)機械轉 矩、(h)軸轉矩及(i)效率。

想問要怎麼判斷這種類型的題目？

試題1 部分答對 得分 0.25/配分1.00 P標示試題 Figure (left) below shows a LC circuit, the top view of the electric and magnetic field inside the capacitor is shown on the right Figure at some time t. Which of the following statements are corrects for the directions of the electric and magnetic fields inside the inductor (top view) and the current at this moment in the circuit? (0) DE A. The magnitude of the current I is increasing at this moment OB. E-field is pointing into page OC. The magnitude of the current I is decreasing at this moment ✓ D. B-field is pointing out of page ✓ E. E-field is counter-clock-wise X OF. The current I is clock-wise OG. E-field is clock-wise ✓H. The current I is counter-clock-wise

工程數學

2. 請以分離變數法解:G.E. âu âu = à ax I.C. u(x,0)=e²x 3. 請以分離變數法求偏微分方程式之通解: du du G.E. =0 0<x<a,0<y<b, 2x² 9² B.C. u(0, y) = 0 u(a, y) = 0 u(x,0) = f(x) u(x, b) = g(x) x>0,t>0 u=0 0 u = g(x) du d'u a²+ 8₁² u= f(x) u=0 a

我想要知道這題的解題過程，算了好幾次都不對..

13.6474.204 練習題8.12 試求圖 8.30 電路的I。 I 答:9.546/33.8° A. 142 -j312 8 92 + 45/30° V j52 000 5 S2 1012 -j2 2 8.30 練習題 8.12 的電路

大一線性代數 請問這題怎麼解

EX. S = { 1 + 3x+X* ²X², X+2*, -3 +67€ 23, 3+48-28 229 2-48= 3} is a subset of P3, Find a subset of 5 that forms a basis of Spanis).

想請問一下這題怎麼解呢？

ledah (1-x)2 = h (1x

請問要怎麼把圖一的表格匯入到phpmyadmin裡呢？我結構是設定圖二這樣，也有試過load data infile了是圖三那樣但都錯誤，拜託大家幫我解惑，想了兩天還是沒有頭緒。

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來人啊 快把這題目斬了

2.2 A batch of 100g of Na2SO4 is dissolved in 200g of H2O and the solution is cooled until 100g of Na2SO4:10H20 is crystallized out. Please do a DOF analysis and calculate the composition of the remaining solution. (Na2SO4:10 H20 = 322.2, Na2SO4=142.05) Answer: DOF = 0; Na2SO4 28%, H20 72% =

A 1.75-kN·m torque is applied to the solid cylinder shown. Determine (a) the maximum shearing stress, (b) the percent of the torque carri... 繼續閱讀

50 mm 25 mm 1.75 kN.m