1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elza [17]
3 years ago
10

A Carnot engine has a power output of 150 kW. The engine operates between two reservoirs at 20.0°C and 500°

Physics
2 answers:
Nookie1986 [14]3 years ago
8 0
Efficiency η of a Carnot engine is defined to be: 
<span>η = 1 - Tc / Th = (Th - Tc) / Th </span>
<span>where </span>
<span>Tc is the absolute temperature of the cold reservoir, and </span>
<span>Th is the absolute temperature of the hot reservoir. </span>

<span>In this case, given is η=22% and Th - Tc = 75K </span>
<span>Notice that although temperature difference is given in °C it has same numerical value in Kelvins because magnitude of the degree Celsius is exactly equal to that of the Kelvin (the difference between two scales is only in their starting points). </span>

<span>Th = (Th - Tc) / η </span>
<span>Th = 75 / 0.22 = 341 K (rounded to closest number) </span>
<span>Tc = Th - 75 = 266 K </span>

<span>Lower temperature is Tc = 266 K </span>
<span>Higher temperature is Th = 341 K</span>
rjkz [21]3 years ago
5 0

Answer:

8.8 × 10³³J

Explanation:

efficiency of an engine η  = net work output ÷ heat input = 1 - \frac{T_{c} }{T_{H} }

T_{H} = 500 + 273 =773K

T_{C} = 20 + 273 =293K

n_{c} = 1 - \frac{293}{773}

  =0.62

power output= work output = 150kW

power output per hour = 150 × 1000×3600

                                     =5.4×10⁸J

recall, net work output ÷ heat input = 1 - \frac{T_{c} }{T_{H} }

∴ 0.62= 5.4×10⁸ ÷ heat input

heat input= 5.4×10⁸÷0.62

=8.81×10⁸J

You might be interested in
A train travels 200km/hr. how much distance will the train be from the station in 2.5 hours?
SCORPION-xisa [38]

Answer:

500km

Explanation:

Given parameters:

Speed  = 200km/hr

Time taken  = 2.5hrs

Unknown:

Distance  = ?

Solution:

To solve this problem, we use the speed, time and distance equation.

   Therefore;

  Distance  = Speed x time

So;

  Distance  = 200 x 2.5  = 500km

6 0
2 years ago
What scientific principle causes the different layers of the earth
Vedmedyk [2.9K]

Answer: The stratification of earth into its geologic layers was brought about by th e formation of the earth iron core.

Explanation:

5 0
3 years ago
A radio station's channel, such as 100.7 fm or 92.3 fm, is actually its frequency in megahertz (mhz), where 1mhz=106hz. calculat
lakkis [162]
When it comes to wave behavior, there are parameters called wavelength and frequency. These two are related by speed of the radiowave. Radiowaves are electromagnetic waves which travels as fast as light. The wavelength is the distance while frequency is the reciprocal of time. When you multiply them both, you get the electromagnetic wave's speed. The equation is c = wavelength*frequency, where c is the speed of light equal to 3 x 10^8 m/s. 

3 x10^8 m/s = wavelength/104.9 x 10^6 Hz   (Hertz is 1/s)
wavelength = 2.86 meters
6 0
3 years ago
Which type of electromagnetic radiation is commonly used for long-distance communications?
Citrus2011 [14]

Answer:

B. Radio waves

Explanation:

Radio waves are transmitted easily through air. They do not cause damage if absorbed by the human body, and they can be reflected to change their direction. These properties make them ideal for communications.

Hope this helps!!

5 0
2 years ago
What is the function of the cardiovascular system?
Lena [83]
The main function of the cardiovascular system is therefore to maintain blood flow to all parts of the body, to allow it to survive. Veins deliver used blood from the body back to the heart.
7 0
3 years ago
Read 2 more answers
Other questions:
  • A wire has a current that flows to the right.
    11·2 answers
  • 565,900 seconds into days​
    6·1 answer
  • WILL MARK BRAINLIEST. Which gas became part of Earth's atmosphere as a result of the evolution of life-forms?
    6·1 answer
  • What are 7 elements from the periodic table that are named after objects in outer space
    5·1 answer
  • In what state must matter exist for fusion reactions to take place?<br><br> ...?
    7·2 answers
  • What is the average speed of a cheetah that runs 70 m in 2.5 seconds?
    8·1 answer
  • Through which of the following ways can heat be transferred?
    12·2 answers
  • Question 5
    6·1 answer
  • A cylindrical region of radius R contains a uniform magnetic field parallel to its axis. The field is zero outside the cylinder.
    10·1 answer
  • Aluminium has a work function of 4. 08 ev. (a) find the cutoff wavelength and cutoff frequency for the photoelectric effect?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!