Solution:
Mass of liquid water and water vapor in the insulated tank initially = 1.4 kg
Temperature = 200 °C
And 25% of the volume by liquid water is steam.
State 1
![$m=\frac{V}{v}$](https://tex.z-dn.net/?f=%24m%3D%5Cfrac%7BV%7D%7Bv%7D%24)
![$m=m_f+m_g$](https://tex.z-dn.net/?f=%24m%3Dm_f%2Bm_g%24)
![$1.4=\frac{0.25V}{v_f}+\frac{0.75V}{v_g}$](https://tex.z-dn.net/?f=%241.4%3D%5Cfrac%7B0.25V%7D%7Bv_f%7D%2B%5Cfrac%7B0.75V%7D%7Bv_g%7D%24)
(taking the value of
and
at 200°C )
![$V=6.304 \times 10^{-3}$](https://tex.z-dn.net/?f=%24V%3D6.304%20%5Ctimes%2010%5E%7B-3%7D%24)
Now quality of vapor
![$x=\frac{m_g}{m}$](https://tex.z-dn.net/?f=%24x%3D%5Cfrac%7Bm_g%7D%7Bm%7D%24)
![$=3.377 \times 10^{-3}$](https://tex.z-dn.net/?f=%24%3D3.377%20%5Ctimes%2010%5E%7B-3%7D%24)
Internal energy at state 1 can be found out by
![$u_1=u_f+xu_{fg}$](https://tex.z-dn.net/?f=%24u_1%3Du_f%2Bxu_%7Bfg%7D%24)
![$=850.65+3.377\times10^{-3}\times 1744.65$](https://tex.z-dn.net/?f=%24%3D850.65%2B3.377%5Ctimes10%5E%7B-3%7D%5Ctimes%201744.65%24)
= 856.54 kJ/kg
After heating with the resistor for 20 minutes, at state 2, the tank contains saturated water vapor ![$v_2=v_g \text { and }\ x=1$](https://tex.z-dn.net/?f=%24v_2%3Dv_g%20%5Ctext%20%7B%20and%20%7D%5C%20x%3D1%24)
Tank is rigid, so volume of tank is constant.
![$v_g=v_2=\frac{V}{m}$](https://tex.z-dn.net/?f=%24v_g%3Dv_2%3D%5Cfrac%7BV%7D%7Bm%7D%24)
![$v_g=\frac{6.304\times 10^{-3}}{1.4}$](https://tex.z-dn.net/?f=%24v_g%3D%5Cfrac%7B6.304%5Ctimes%2010%5E%7B-3%7D%7D%7B1.4%7D%24)
![$v_g=4.502 \times 10^{-3} \ m^3 /kg$](https://tex.z-dn.net/?f=%24v_g%3D4.502%20%5Ctimes%2010%5E%7B-3%7D%20%5C%20m%5E3%20%2Fkg%24)
Now interpolate the value to get temperature at state 2 with specific volume value to get final temperature
![$T_2=360+(374.14-360)\left(\frac{0.004502-0.006945}{0.003155-0.006945}\right)$](https://tex.z-dn.net/?f=%24T_2%3D360%2B%28374.14-360%29%5Cleft%28%5Cfrac%7B0.004502-0.006945%7D%7B0.003155-0.006945%7D%5Cright%29%24)
= 369.11° C
Internal energy at state 2
![$u_2=2154.9 \ kJ/kg$](https://tex.z-dn.net/?f=%24u_2%3D2154.9%20%5C%20kJ%2Fkg%24)
Now power rating of the resistor
![$P=\frac{m(u_2-u_1)}{t}$](https://tex.z-dn.net/?f=%24P%3D%5Cfrac%7Bm%28u_2-u_1%29%7D%7Bt%7D%24)
![$P=\frac{1.4(2154.9-856.54)}{20 \times 60}$](https://tex.z-dn.net/?f=%24P%3D%5Cfrac%7B1.4%282154.9-856.54%29%7D%7B20%20%5Ctimes%2060%7D%24)
= 1.51 kW
Answer:
Left
Explanation:
The force is applied opposite of the acceleration.
Answer:
I guess that the atoms are:
Protons: 6 8 5 2 12 12
Neutrons: 8 8 5 3 13 14
Now, two atoms are isotopes if they share the same number of protons (so both atoms are the same element) but they have a different number of neutrons.
From the given options, the only two that have the same number of protons but a different number of neutrons are:
Protons 12, neutrons 13
and
Protons 12, neutrons 14.
These two are isiotopes.
Solve for Speed: 16+20=36 km in 11 hrs
Answer: speed =
3.27273 kilometers per hourTo solve for speed or rate use the formula for speed, s = d/t which means speed equals distance divided by time.
<span>speed = distance/time</span>