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 railroad car of mass 2,000 kg traveling at a velocity v = 10 m/s is stopped at the end of the tracks by a spring-damper system
Murrr4er [49]
Stopped at the end of the tracks by a spg-damper system, as shown in fig. 1
6 0
2 years ago
What are the characters associated with light as a wave​
Liono4ka [1.6K]

Answer:

Interference of light

Diffraction of light

Polarization of light

Reflection of light

all show the wave nature of light.

6 0
3 years ago
A mass free to vibrate on a level, frictionless surface at the end of a horizontal spring is pulled 35 cm from its equilibrium p
saul85 [17]

Answer:

0.67 s

Explanation:

This is a simple harmonic motion (SHM).

The displacement, x, of an SHM is given by

x = A\cos(\omega t)

A is the amplitude and \omega is the angular frequency.

We could use a sine function, in which case we will include a phase angle, to indicate that the oscillation began from a non-equilibrium point. We are using the cosine function for this particular case because the oscillation began from an extreme end, which is one-quarter of a single oscillation, when measured from the equilibrium point. One-quarter of an oscillation corresponds to a phase angle of 90° or \frac{\pi}{4} radian.

From trigonometry, \sin A =\cos B if A and B are complementary.

At t = 0, x = 3.5

3.5 = A\cos(\omega \times0)

A =3.5

So

x = 3.5\cos(\omega t)

At t = 0.12, x = 1.5

1.5 = 3.5\cos(0.12\omega)

\cos(0.12\omega)=\dfrac{1.5}{3.5}=0.4286

0.12\omega =\cos^{-1}0.4286

0.12\omega = 1.13

\omega = 9.4

The period, T, is related to \omega by

T = \dfrac{2\pi}{\omega} = \dfrac{2\times3.14}{9.4}=0.67

5 0
3 years ago
Stephanie lives in California,and her cousin Thomas lives in France. which coordinate system would be most useful if the two wan
qwelly [4]

Answer:

Equatorial

Explanation:

Your welcomee

8 0
3 years ago
calculate the spring constant if a weight of 250N is added to a spring which increases in length by 20cm
ZanzabumX [31]
Since, F = k . ∆x

Therefore, k = F / ∆x = 250 / 0.2 = 1250 N/m

(ps: convert 20 cm into 0.2 m)
8 0
3 years ago
Other questions:
  • A proton is placed in an electric field of intensity 700 n/
    13·1 answer
  • Does the earths magnetic field change with time?
    13·1 answer
  • A cylinder contains 12liters of O2 at 20°c and 15atm. The temperature is raised to 35°c and volume is reduced to 8.5L. Calculate
    11·1 answer
  • The radar gun measures the frequency of the radar pulse echoing off your car. By what percentage is the measured frequency diffe
    7·1 answer
  • What do comets and asteroids have in common? Check all that apply.
    11·2 answers
  • The word electromagnetism in physics is used to describe one of the fundamental forces of nature this force is between somatic p
    15·1 answer
  • Is the following hypothesis scientific? Why? "Intelligent life exists on other planets
    14·2 answers
  • Water can form large dewdrops in nature how would droplets made of vegetable oil instead of water be different
    15·2 answers
  • MELAINE complete a long distance run at the average speed of 60 mph if it takes her 3 hours how far did she Run
    14·1 answer
  • A car of mass 1000 kg is heading east at 25 m/s. It collides with a car of mass 12000 kg heading north at 30 m/s. When the cars
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!