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valkas [14]
2 years ago
5

Help ASAP 100 points

Physics
1 answer:
Gwar [14]2 years ago
7 0

Answer:

other galaxies is red shifted

Question 5 (1 point)

What does a blue shift in light from stars indicate?

Question 5 options:

The stars are moving randomly.

The stars are moving closer.

The stars are moving farther away.

The stars are stationary

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His eyes are 1.64 m above the floor and the top of his head is 0.14 m higher. Find the height (in m) above the floor of the top
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Height above the floor from the bottom is 0.82m

Form the top is 1.71m

Explanation:

See attached file

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Water enters the turbine of an ideal Rankine cycle as a superheated vapor at 18 MPa and 550°C. If the condenser pressure is 9 kP
ivolga24 [154]

Answer:

For this ideal Rankine cycle:

A) The rate of heat addition into the cycle Qh is 3214.59KJ/Kg.

B) The thermal efficiency of the system εt=0.4354.

C) The rate of heat rejection from the cycle Qc is 1833.32KJ/Kg.

D) The back work ratio is 0.013

Explanation:

To solve the ideal Rankine cycle we have to determinate the thermodynamic information of each point of the cycle. We will use a water thermodynamic properties table. In an ideal Rankine cycle, the process in the turbine and the pump must be isentropic. Therefore S₃=S₄ and S₁=S₂.

We will start with the point 3:

P₃=18000KPa  T₃=550ºc ⇒ h₃=3416.12 KJ/Kg  S₃=6.40690 KJ/Kg

Point 4:

P₄=9KPa S₄=S₃ ⇒ h₄=2016.60 (x₄=0.7645 is wet steam)

Point 1:

P₁=P₄ in the endpoint of the steam curve. ⇒ h₁= 193.28KJ/Kg  S₁=0.62235KJ/Kg  x₁=0

Point 2:

P₂=P₃ and S₂=S₁ ⇒ h₂=201.53KJ/Kg

With this information we can obtain the heat rates, the turbine, and the pump work:

Q_h=Q_{2-3}=h_3-h_2=3214.59KJ/Kg

Q_c=Q_{4-1}=h_4-h_1=1833.32KJ/Kg

W_{turb}=W_{3-4}=h_3-h_4=1399.52KJ/Kg

W_{pump}=W_{1-2}=h_2-h_1=18.25KJ/Kg

We can answer the questions with this data:

A) Q_h=Q_{2-3}=h_3-h_2=3214.59KJ/Kg

B) \epsilon_{ther}=\displaystyle\frac{W_{turb}}{Q_h}=0.4354

C)Q_c=Q_{4-1}=h_4-h_1=1833.32KJ/Kg

D) r_{bW}=\displaystyle\frac{W_{pump}}{W_{turb}}=0.013

3 0
3 years ago
What is the speed of a car going v=1.000mph in SI units? Notice that you will need to change from miles to meters and from hours
Paha777 [63]

Answer: speed = 446.4m/s

Explanation: 1000mph implies that 1000 miles / 1 hour.

But it has been given that 1mile = 1609m,

hence

1000 miles = 1000 * 1609 = 1,609,000m

And I hour = 3600s

Hence 1000mph = 1,609,000/ 3600

1000 = 446.4m/s

5 0
2 years ago
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