- What is the Laplace inverse of
__s²+1__/s²__(__s²-4s-9)

Adesina Sherif Adesola
2022-08-16

- What is the Laplace inverse of
__s²+1__/s²__(__s²-4s-9)

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An industrial designer wants to determine the average time it takes for an adult to assemble a toy. 24 people were randomly chosen to assemble the toy and the time taken (in minutes) were as follows:

17, 13, 18, 19, 17, 21, 29, 22, 16, 28, 21, 15 26, 23, 24, 20, 8, 17, 17, 21, 32, 18, 25, 22

Using interval estimate to infer the population mean with a 95% confidence level

17, 13, 18, 19, 17, 21, 29, 22, 16, 28, 21, 15 26, 23, 24, 20, 8, 17, 17, 21, 32, 18, 25, 22

Using interval estimate to infer the population mean with a 95% confidence level

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The level surface of the function $f(x,y,z)=({x}^{2}+{y}^{2}{)}^{-1/2}$ are

a) Circles centered at the origin b) spheres centered at the origin c) cylinders around the z-axis d) upper halves of spheres centered at the origin

I had chosen a) asmy answer, but it turns out the answer is c). Could someone help me understand why?

a) Circles centered at the origin b) spheres centered at the origin c) cylinders around the z-axis d) upper halves of spheres centered at the origin

I had chosen a) asmy answer, but it turns out the answer is c). Could someone help me understand why?

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Advanced Math

A bipolar alkaline water electrolyzer stack module comprises 160 electrolytic cells that have an effective cell area of$2{m}^{2}$ . At nominal operation, the current density for a single cell of the electrolyzer stack is 0.40 $\frac{A}{c}{m}^{2}$ . The nominal operating temperature of the water electrolyzer stack is $70}^{\circ$ C and pressure 1 bar. The voltage over a single electrolytic cell is 1.96 V at nominal load and 1.78 V at 50% of nominal load. The Faraday efficiency of the water electrolyzer stack is 95% at nominal current density, but at 50% of nominal load, the Faraday efficiency decreases to 80%.

(Give your answer to at least three significant digits.)

Calculate the nominal stack voltage:

Answer in V

Calculate the nominal stack current:

Answer in A

Calculate the nominal power on the water electrolyzer stack:

Answer in kW

A bipolar alkaline water electrolyzer stack module comprises 160 electrolytic cells that have an effective cell area of

(Give your answer to at least three significant digits.)

Calculate the nominal stack voltage:

Answer in V

Calculate the nominal stack current:

Answer in A

Calculate the nominal power on the water electrolyzer stack:

Answer in kW