Answer:
The effect of lowering the condenser pressure on different parameters is explained below.
Explanation:
The simple ideal Rankine cycle is shown in figure.
Effect of lowering the condenser pressure on
(a). Pump work input :- By lowering the condenser pressure the pump work increased.
(b) Turbine work output :- By lowering the condenser pressure the turbine work increased.
(c). Heat supplied :- Heat supplied increases.
(d). Heat rejected :- The heat rejected may increased or decreased.
(e). Efficiency :- Cycle efficiency is increased.
(f). Moisture content at turbine exit :- Moisture content increases.
1: Explain how you can use Boyle’s Law to determine the new volume of
gas when its pressure is increased from 270 kPa to 540 kPa? The original
volume of gas was 1 L. Assume the temperature and number of particles are constant. What is the new volume?
Boyle's Law of gases: At constant temperature, the volume of a gas is inversely proportional to the pressure of the gas.
This is pV = constant. Then 1 L * 270 kPa = x * 540 kPa => x = 1L*270 kPa /540 kPa = 0.5 L
2: What are three common clues that a chemical change has occurred?
- Change of color
- Production of bubles
- Change of temperature
- Production of odors / smell
- Formation of precipitates (solids)
3: You have a sealed glass jar full of air. If you put it in the freezer, what happens to the gas pressure in the jar?
The pressure decreases, according to Gay-Lussac, at constant volume, the pressure and the temperaure of a gas are proportional.
Then at lower temperature (inside the freezer) the pressure in the jar will decrase.
4: Name and describe the phase change that occurs when solid carbon
dioxide (dry ice) is placed in an open container at room temperature.
This change of phase is called Sublimation. The solid passes directly to gas state, without passing by the liquid state.
Answer:
Explanation:
Assuming this problem: "Carbon dioxide enters an adiabatic nozzle at 1200 K with a velocity of 50 m/s and leaves at 400 K. Assuming constant specific heats at room temperature, determine the Mach number (a) at the inlet and (b) at the exit of the nozzle. Assess the accuracy of the constant specific heat assumption."
Part a
For this case we can assume at the inlet we have the following properties:
We can calculate the Mach number with the following formula:
Where k represent the specific ratio given k =1.288 and R would be the universal gas constant for the carbon diaxide given by:
And if we replace we got:
Part b
For this case we can use the same formula:
And we can obtain the value of v2 from the total energy of adiabatic flow process, given by this equation:
The value of and the value fo T2 = 400 K so we can solve for and we got:
And now we can replace on this equation:
And we got:
Answer:
Distance of Alpha century in miles
Distance of Alpha century in Astronomical unit
Explanation:
Given
Distance of Alpha Centauri from the Solar System light year
Light year is the distance traveled by light in one year. Its a unit of measurement for distant celestial objects
One light year miles
Total number of miles in light years is equal to
Distance of Alpha century in miles
Number of astronomical units in one light year
Total number of astronomical units in light years is equal to
Distance of Alpha century in Astronomical unit
Answer:
18 ohms
Explanation:
V = I(R1 + R2)
5V = (0.167A)(12 ohms + R2)
Solving for R2
R2 = 18 ohms