Physics, 10.03.2020 07:08 kyleg1711

2. A cylinder/piston arrangement contains water at 105ºC, 85% quality, with a volume of 1 L. The system is heated, causing the piston to rise and encounter a linear spring. At this point the volume is 1.5 L, the piston diameter is 150 mm, and the spring constant is 100 N/mm. The heating continues, so the piston compresses the spring. What is the cylinder temperature when the pressure reaches 200 kPa?

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Answer from: weeblordd

Explanation:

The given data is as follows.

$T_{1} = 105^{o}C$ , x = 0.85

$V_{1}$ = 1 L = 0.001 $m^{3}$ (as 1 L = 0.1 $m^{3}$ )

$V_{2}$ = 1.5 L = 0.0015 $m^{3}$ ,

$d_{p}$ = 150 mm = 0.15 m, K = 100 N/mm = 100 kN/m

$P_{3}$ = 200 kPa

According to the table,

$P_{1}$ = 120.8 kPa, $v_{f}$ = 0.001047 m/kg

$v_{fg} = 1.41831 <img src=$

So, we have

$v_{1} = v_{f} + xv_{fg}$

= 0.001047 + 0.85 \times (1.41831 m^{3}/kg)" alt="m^{3}/kg" />

So, we have

$v_{1} = v_{f} + xv_{fg}$

= 0.001047 + 0.85 \times (1.41831 m^{3}/kg)" />

= 1.2066 $m^{3}/kg$

Now, we will calculate $m_{1}$ as follows.

$m_{1} = \frac{V_{1}}{v_{1}}$

= $\frac{0.001}{1.2066}$

= 0.000828 kg

Now, Area = $\frac{\pi}{4} dp^{2}$

= $\frac{\pi}{4} (0.15)^{2}$

= 0.0176 $m^{2}$

As we have,

$v_{2} = v_{1} \times (\frac{V_{2}}{v_{1}})$

= $1.2066 \times \frac{0.0015}{0.001}$

= 1.8099 $m^{3}/kg$

From table, $T_{2} = 203.5^{o}C$ for $P_{2}$ = 120.8 kPa and $v_{2} = 1.8099 m^{3}/kg$ .

$P_{3} = P_{2} + (\frac{K}{A^{2}})m (v_{3} - v_{2})$

200 = $120.8 + (\frac{100}{(0.0176)^{2}})(0.000828)(v_{3} - 1.8099)$

$v_{3} = 2.106 m^{3}/kg$

Therefore, from the table

T = $600^{o}C$ , v = 2.01297 $m^{3}/kg$

T = $700^{o}C$ , v = 2.2443 $m^{3}/kg$

$T_{3} = 600 + \frac{2.106 - 2.01297}{2.2443 - 2.01297} (700 - 600)$

= $640.2^{o}C$

Thus, we can conclude that the cylinder temperature when the pressure reaches 200 kPa is $640.2^{o}C$ .

Answer from: Quest

Answer

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

explanation

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

Answer from: Quest

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

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2. A cylinder/piston arrangement contains water at 105ºC, 85% quality, with a volume of 1 L. The sys...

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