Numerade

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Choose the option that best completes the following sentence: When the Reynolds number is large, [ ] forces dominate and the flow is considered to be [ ]. Choice 1 of 4: inertial; laminarChoice 2 of 4: inertial; turbulantChoice 3 of 4: viscous; laminarChoice 4 of 4: viscous; turbulent

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When 7 grams of Zn(M.W= 65.38g/mol) combines with enough HCl to make 76 ml of HCl(aq) in a coffee cup calorimeter, all of the zine reacts, which increases the temperature of the HCl solution from 20 C to 27 C. Calculate the enthalpy change of the reaction Hrxn per mol of zinc(Assume the density of the solution is 1.00 g/mL and the specific heat capacity of solution is 4.184 J/g c)

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TheThe difference between actual cost incurred and standard cost is called the

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Find the lengths of the sides of the triangle ABC with the indicated vertices. A (8, -1, -1) B(2, 0, -8) C(7, 9, -1) |AB| = |AC| = |BC| = Determine whether the triangle ABC is a right triangle, an isosceles triangle, or neither. right triangle isosceles triangle neither

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Which of the matrices above are similar? \begin{pmatrix} 0 & 1 & 0 & 0 \\ 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 1 \\ 0 & 0 & 0 & 0 \end{pmatrix} (3) Let $A = \begin{pmatrix} 0 & 1 & 0 & 0 \\ 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 1 \\ 0 & 0 & 0 & 0 \end{pmatrix}$ and $B = \begin{pmatrix} 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 \end{pmatrix}$. Determine whether A is similar to B or not. Justify your answer.

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Texts: 13) Given the following valid argument, supply the reason that justifies each statement: Statement: Reason: 1. ~(m → n) v h 1. m → n 2. h → ~(a → w) 2. ~(m → n) v h 3. m → n 3. h 4. h → ~(a → w) 4. ~p → (a → w) 5. p v s 5. ~(a → w) 6. ~(a → w) 6. ~p → (a → w)

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Find the slope and the y-intercept of the line with the following equation: y = (7/8)x - 9.

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Text: 44. Let 1 2 0 1 A : R^4 -> R^2 as a linear transformation. a.) Find a basis for the Ker(A) and R(A). b.) Find a basis for the Ker(A^T) and R(A^T). c.) Show that Ker(A)âŠ¥ = R(A^T).

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A body of unknown material is floating in water, with half of its volume remaining outside of water. The density of the material is $2.0 \times 10^3 \text{ kg/m}^3$ $1.0 \times 10^3 \text{ kg/m}^3$ $1.5 \times 10^3 \text{ kg/m}^3$ $0.5 \times 10^3 \text{ kg/m}^3$

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QUESTION ONE a. Show that in a star connected generator, the line-to-line voltage is related to the generated phase voltage by $V_{LL} = \sqrt{3}V_{PH}\angle(\theta_{PH} + 30^\circ)$ b. An unbalanced three phase star connected load of $Z_A = (80 + j50)\Omega$, $Z_B = (20 + j30)\Omega$ and $Z_C = (80 - j40)\Omega$, is supplied from a star connected, 3 wire, 240V, 50 Hz per phase source. Calculate the following: i. the line currents taken by each load ii. the voltages across each of the loads iii. the displacement neutral voltage iv. The real and reactive power drawn from the source and the power factor. Draw a phasor diagram showing, the source phase voltages, load voltage drops, the displacement voltage and the line currents QUESTION TWO a. From first principles, show that the instantaneous power in a balanced three phase network is not pulsating. What is the significance of the power not being pulsating? b. A 480 V source supplies 4 parallel connected balanced three phase loads: Load 1: 150kVA @ 0.8 pf leading Load 2: 100kW @ unity pf Load 3: 200kVA @ 0.6 pf lagging Load 4: 80 kW and 95 kVAr (inductive) i) Calculate the overall power factor of the loads as seen by the source ii) Calculate the amount of reactive power required to bring the overall power factor to unity iii) Calculate the capacitance value of the delta connected capacitor bank connected in parallel to the loads to achieve unity power factor.

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jonathan a.