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Anna11 [10]
4 years ago
9

A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 10 kJ of heat is tra

nsferred to the water, and heat losses from the side walls amount to 80 J. The piston rises as a result of evaporation, and 2 J of work is done by the vapor. Determine the change in the energy of the water for this process.
Engineering
1 answer:
grigory [225]4 years ago
6 0

Answer: 9.9KJ

Explanation: Q = U + W + losses

Q is heat transfered to the water

U is the change in energy of the system

W is work done by the system = 2J

Losses = 80J

Heat into system is 10kJ = 10000KJ

Therefore

U = Q - W - losses

U = 10000 - 2 - 80 = 9990J

= 9.9kJ

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Consider a fluid with mean inlet temperature Ti flowing through a tube of diameter D and length L, at a mass flow rate m'. The t
EleoNora [17]

Answer:

T_m(x) = T_i+\frac{\pi D}{\dot{m}c_p}(ax+\frac{bL}{\pi}-\frac{bL}{\pi}cos(\frac{x\pi}{L}))

Explanation:

Our data given are:

T_i = Mean temperature (inlet)

D = Diameter

L = Length

\dot{m}=Mass flow rate

Equation to surface flow as,

q(x) = a+bsin(x\pi/L)

We need to consider the perimeter of tube (p) to apply the steady flow energy balance to a tube , that is

q(x)pdx=\dot{m}c_p dT_m

Where p=\pi D

Re-arrange for dT_m,

dT_m = \frac{q(x)pdx}{\dot{m}c_p}

Integrating from 0 to x (the distance intelt of pipe) we have,

\int\limit^{T_m(x)}_T_i dT_m = \frac{p}{mc_p}\int_0^x q(x)dx

Replacing the value of q(x)

\int\limit^{T_m(x)}_T_i dT_m = \frac{p}{mc_p}\int_0^x (a+bsin(x\pi/L))dx

T_m(x)-T_i = \frac{\pi D}{\dot{m}c_p}\int_0^x(a+bsin(x\pi/L))dx

T_m(x)-T_i = \frac{\pi D}{\dot{m}c_p}(ax-\frac{bL}{\pi}cos(\frac{x\pi}{L}))^x_0

T_m(x) = T_i+\frac{\pi D}{\dot{m}c_p}(ax+\frac{bL}{\pi}-\frac{bL}{\pi}cos(\frac{x\pi}{L}))

8 0
3 years ago
A worker's hammer is accidentally dropped from the 20th floor of a building under construction. With what velocity does it strik
Illusion [34]

Answer:

Final Velocity (Vf)= 139.864 ft/s

Time (t)= 4,34 s

Explanation:

This is a free fall problem, to solve it we will apply free  fall concepts:

In a free fall the acceletarion is gravity (g) = 9,81 m/s2, if we convert it to ft/s^2 = g= 32.174 ft/s^2

  • Final velocity is Vf= Vo+ g*t[tex]Vf^{2} = Vo^{2} +2*g*h

where h is height (304 ft in this case).

Vo =0 since the hammer wasn't moving when it stared to fall

Then Vf^2= 0 + 2* 32.174 ft/s^2 *304 ft

          Vf^2= 19,561.8224  ft^2/s^2

          Vf=[sqrt{19561.8224 ft^2/s^2}

          Vf=139.864 ft/s

Time t= (Vf-Vo)/g => (139.864 ft/s-0)/32.174 ft/s^2 = 4.34 sec

Good luck!

8 0
3 years ago
4. In the Hyatt Regency walkway case study, it is reported that Jack Gillum stamps the 42 shop drawings, including the revised S
mario62 [17]

Answer:

Responsibility

Explanation:

By stamping the drawings that he was looking over, Jack Gillum conveys the fact that he is accepting responsibility for this work. The purpose of Gillum's stamp is to explain that such work has been under engineering review, and that it has fulfilled all the requirements that he watches our for. By putting his stamp in this work, Gillum accepts responsibility in case an error or a discrepancy is found in the drawings.

3 0
3 years ago
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Svetllana [295]

Answer:

Forces like wind and water break down rocks through the processes of weathering and erosion. ... Forces like wind and water move the rock pieces. They mix with matter like sand to become sediment. Weathering and erosion help shape Earth's surface.

5 0
3 years ago
Read 2 more answers
Explain the benefits of reading A vocabulary section at the beginning of a text
Zinaida [17]

Answer: Deatiled information

Explanation:

It helps the reader organize and sort information in the text. It provides detailed information about the content of the text. It prepares readers to look for new vocabulary as they read.

3 0
4 years ago
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