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olga55 [171]
3 years ago
8

A mass of 7 kg undergoes a process during which there is heat transler frorn the mass at a rate of 2 kJ per kg, an elevation dec

rease of 40 m, and an increase in velocity from 13 m/s to 23 m/s. The specific internal energy decreases by 4 kJ/kg and the acceleration of gravity is constant at 9.7 m/s2. Determine the work for the process, in k.J
Engineering
1 answer:
irinina [24]3 years ago
4 0

Answer:44.61 KJ

Explanation:

Let h_1,V_1,Z_1 be the initial specific enthalpy,velocity&elevation of the system

and h_2,V_2,Z_2 be the Final specific enthalpy,velocity&elevation of the system

mass(m)=7kg

Applying Steady Flow Energy Equation

m\left [ h_1+\frac{v_1^2}{2g}+gZ_1\right ]+Q=\left [ h_2+\frac{v_2^2}{2g}+gZ_2\right ]+W

h_1-h_2=4 KJ/kg

V_1=13m/s

V_2=23m/s

Z_1-Z_2=40m

substituting values

7\left [ h_1+\frac{13^{2}}{2g}+gZ_1\right ]+7\times2 = \left [ h_2+\frac{23^2}{2g}+gZ_2\right ]+W

W=7\left [h_1-h_2+\frac{V_1^2-V_2^2}{2000g}+g\frac{\left (Z_1-Z_2 \right )}{1000}\right ]+Q

W=7\left [4+\frac{13^2-23^2}{2000g}+g\frac{\left (40 \right )}{1000}[\right ]+2\times 7

W=44.61KJ

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The answer is A.

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Answer:

The engineers disagreed because their jobs were on the line

The ethical factors are:

The reason for the customer dumping the business is yet to be figured out

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The are several ways of growing customer base which  are yet to be exploited.

Explanation:

The engineers disagree because there is no direct connection between the company's loss of the customer and their proposed layoff of the engineers,at least no one strong evidence has been given by the president.

The ethical factors inherent in this case are as follows:

The reason for the customer dumping the business is yet to be figure out

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The are several ways of growing customer base which  are yet to be exploited.

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