What do these two changes have in common?

A 3-ft3 rigid tank initially contains saturated water vapor at 300°F. The tank is connected by a valve to a supply line that car

zhannawk [14.2K]

Explanation:

$Given\\V=3ft^3\\T_{1} =300^oF\\T_{L} =400^oF\\P_{L} =200psia\\V_{f} =0.5V$

We assume kinetic and potential energy changes are negligible and there is no work interactions.

a) Taking tank as a system, The energy balance can be define as

$E_{in}- E_{out}= E_{sys}$

$m_{i} h_{L} -Q_{out}=m_{2} u_{2}-m_{1} u_{1}$

The mass balance could be written as

$m_{in}- m_{out}= m_{sys} \\m_{i}= m_{2}- m_{1}$

The final pressure in the tank could be defined as following

$P_{2} =P_{sat300^oF}$

from standard steam table we know at

$T_{2}= T_{1}=300^oF\\ P_{2}=67.028psia$

b)

From steam table at

$T_{1} =300^oF\\v_{1}= v_{g}=6.4663ft^3/lbm\\v_{1}= v_{g}=1099.8Btu/lbm\\ v_{f} =0.01745ft^3/lbm\\v_{f} =269.51Btu/lbm\\$

$at\\P_{L} =200psia\\T_{L}=400^oF\\h_{L}=1210.9Btu/lbm$

initial mass in the tank could be define as

$m_{1}=\frac{V}{v_{1} } \\m_{1} =\frac{3}{6.4663} =0.464lbm\\$

Final mass in the tank could be define as

$m_{2}=\frac{V_{f} }{v_{f} }+\frac{V_{g} }{v_{g} } \\ m_{2} =\frac{1.5}{0.01745} +\frac{1.5}{6.4663} =86.2lbm$

The amount of steam that has entered the tank

$m_{i}=m_{2}- m_{1}\\ m_{i}=86.2-0.464=85.74lbm$

c)

The internal energy in final state could be defined as following

$U_{2}=m_{f} u_{f}+ m_{g} u_{g}\\ U_{2} =85.96*269.51+0.232*1099.8=23422Btu\\$

The heat transfer could be defined as following

$Q_{out}=m_{i} h_{L}+m_{1} u_{1}-m_{2} u_{2}\\ Q_{out}=85.74*1210.9+0.464*1099.8-23422=80910Btu$

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3 years ago

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Determine the unbalanced force necessary to accelerate a 2.60 kg object at a rate of 14.0 m/s².

slega [8]

Answer:

Explanation:

F = ma

F = 2.60(14.0)

F = 36.4 N

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Which statement is true about an object that sinks in water?

bogdanovich [222]

It is about density. The less dense object will tend to float when put into the water. For example, oil is denser than water so the result of the mixture would make oil float. Sinking objects would only mean that it has an equal or greater mass than water.

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Keplers work revealed that the sun was

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"orbiting the Sun in an elliptical orbit"

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1. According to Dalton's Atomic theory which statement is correct from the following statement?

vlabodo [156]

Answer:

the mass is distributed uniformly in an atom

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3 years ago

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