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
Genrish500 [490]
3 years ago
5

The temperature inside a Carnot refrigerator placed in a kitchen at 22 degree Celcius is 2 degree Celcius. The heat extracted fr

om the refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?
Physics
1 answer:
Elanso [62]3 years ago
4 0

Answer: 1.79 kW

Explanation:

Given

The temperature of the refrigerator is T_L=2^{\circ}C\approx 275\ K

The temperature of the kitchen is T_H=22^{\circ}C

COP of the refrigerator is

COP=\dfrac{T_L}{T_H-T_L}=\dfrac{\text{Desired effect}}{\text{Power}}\\\\\Rightarrow COP=\dfrac{275}{22-2}=\dfrac{89}{P}\\\\\Rightarrow P=\dfrac{20}{275}\times 89=6.47\ MJ/h\ \text{or}\ 1.79\ kW

You might be interested in
The Tour de France is the biggest bicycle race in the world. The race lasts for three weeks and is one of the biggest sporting e
avanturin [10]

Answer:

Yellow, green, polka dot and white jerseys

Explanation:

Tour de France is the biggest bicycle race in the world held at France over a period of 23 days. At the end of each day of racing they give to the certain riders FOUR different colored jerseys:

  1. The yellow jersey is given to the overall winner at each stage, this shows the rider who was the best in the previous stage.
  2. The green jersey is given to the best sprinter of each stage,
  3. The polka dot jersey is given to the rider who first reach the crest of designated hills and mountains at each stage.
  4. The white jersey is given to the fastest rider at each stage under 25 years at the beginning of the racing year.

At the end of the competition, the total points are counted and the different jerseys are given to the overall winners.

5 0
3 years ago
"how long would it take for a ball dropped from the top of a 400-foot building to hit the ground? round your answer to two decim
Lelechka [254]
Hello

Let's convert first the height from foot to meters:
S=400~ft=121.92~m
This is the space covered by the ball in its accelerated motion, where the acceleration is the gravitational acceleration:
a=g=9.81~m/s^2
The law of motion is given by
S= \frac{1}{2}at^2
Re-arranging, we can get the total time of the motion:
t= \sqrt{ \frac{2S}{a} }=4.99~s

which is the time the ball takes to hit the ground.
7 0
3 years ago
Read 2 more answers
5) What is meant by the term trough?​
Vlad [161]

Answer:

upper part of any wave.

Explanation:

we normally define wave motion in term of movement of particles. compressions and rarefaction. rarefaction particles apart , and same as trough ( part of wave above mean line ).

8 0
4 years ago
Read 2 more answers
How do simple machines make work easier?
castortr0y [4]
 work is defined as force acting on an object in the direction of motion, a machine makes work easier to perform by accomplishing one or more of the following functions: transferring a force from one place to another, changing the direction of a force, increasing the magnitude of a force, or increasing the distance or speed of a force
<span>D. They increase the distance over which a force is applied.</span>
3 0
3 years ago
Read 2 more answers
Gas stored in a tank at 273 k has a pressure of 388kpa. The safe limit for the pressure is 825kpa at whst temperature Will gas r
vagabundo [1.1K]

Answer:

The answer to your question is  T2 = 580.5 °K

Explanation:

Data

Temperature 1 = T1 = 273°K

Pressure 1 = P1 = 388 kPa

Pressure 2 = P2 = 825 kPa

Temperature 2 = ?

Process

1.- Use the Gay-Lussac law

                  P1/T1 = P2/T2

-Solve for T2

                  T2 = P2T1/P1

-Substitution

                  T2 = (825)(273) / 388

-Simplification

                   T2 = 225225 / 388

-Result

                    T2 = 580.5 °K

6 0
4 years ago
Other questions:
  • the gas in a balloon has P=100000 pa and v=0.0279 m^3. if the pressure increases to 120000 pa at constant temperature, what is t
    15·2 answers
  • A crane raises a 150 N weight to a height of 2.0 m in in 5.0 s. The crane does work at a rate of
    13·2 answers
  • Explain a compression and a refraction of a sound wave traveling though the air
    5·1 answer
  • To change a tire, you need to use a jack to raise one corner of your car. While doing so, you happen to notice that pushing the
    12·1 answer
  • A solid concrete block weighs 150. N and is resting on the ground. Its dimensions are 0.400 m ✕ 0.200 m ✕ 0.100 m. A number of i
    7·1 answer
  • What is a frequency of a ships whistle if the velocity of sound is 340 meters/ second and the wave length is 1.70?
    5·1 answer
  • Which of the following is the time it takes to complete a cycle of motion
    11·1 answer
  • 45 joules were expended to move a box weighing 30 newtons. How many meters was it moved?
    10·1 answer
  • Given w= 4+,- 0.02 A=2.0+,-0.2 and 3.0+,-0.6 what is the value of w\ A y square
    12·1 answer
  • Explain how water is controlled to generate electrical energy in hydro-electric dams. and show a diagram is help explain the ans
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!