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
mina [271]
3 years ago
15

The motor in a refrigerator has a power output of 400 W. If the freezing compartment is at 273 K and the outside air is at 306 K

, assuming ideal efficiency, what is the maximum amount of heat (in joules) that can be extracted from the freezing compartment in 80.0 minutes?
Physics
1 answer:
Aleksandr [31]3 years ago
7 0

Answer:15,883.63 KJ

Explanation:

Given

Power=400 W

Freezing compartment temperature is 273 K(T_L)

Outside air Temperature=306 K(T_H)

Time =80 minutes

Energy Required to deliver 400 w power in 80 minutes

E=1920 KJ

and we know COP of refrigerator is given by

COP=\frac{T_L}{T_H-T_L}=\frac{Desired\ effect}{Work}

\frac{273}{306-273}=\frac{D.E.}{1920}

D.E.=8.27\times 1920=15883.63 KJ

Therefore 15,883.63 KJ is removed in 80 minutes

You might be interested in
The sun looks like a cloud of hot steam is exploding from its surface. What is the most likely explanation.
Elenna [48]
The most likely explanation for the sun looking like a cloud of hot steam is exploding from the surface is coronal mass ejections. The correct answer is C. 
7 0
3 years ago
Read 2 more answers
Fiber optics are an important part of our modern internet. In these fibers, two different glasses are used to confine the light
motikmotik

Answer:

n_cladding = 1.4764

Explanation:

We are told that θ_max = 5 °

Thus;

θ_max + θ_c = 90°

θ_c = 90° - θ_max

θ_c = 90° - 5°

θ_c = 85°

Now, critical angle is given by;

θ_c = sin^(-1) (n_cladding/n_core)

sin θ_c = (n_cladding/n_core)

n_cladding = (n_core) × sin θ_c

Plugging in the relevant values, we have;

n_cladding = 1.482 × sin 85

n_cladding = 1.4764

7 0
3 years ago
1. Which of these is not a natural fibre?<br>a. leather<br>b. jute<br>C.Wool<br>d. cotton​
Oksanka [162]

Answer:

leather

Explanation:

plz mark as brainliest......hope it helps

6 0
3 years ago
Read 2 more answers
A sonar pulse sent out by a boat arrives back after 4 seconds. If the speed of sound in water is 1600m/s, how deep is the water?
Varvara68 [4.7K]

Answer:

the boat would be deeped by 3200 m

Explanation:

Given that

The boat arrives back after 4 seconds

And, the speed of the sound in water is 1,600 m/s

We need to find out how much deep is the water

So,

As we know that

Distance = ( speed × time) ÷ 2

Here we divided by 2 because the boat arrives back

= (1600 × 4) ÷ 2

= 3200 m

Therefore the boat would be deeped by 3200 m

7 0
3 years ago
The old rubber boot has two leaks. The top of the boot is 0.3 m higher than the leaks. What is the velocity of the water coming
Otrada [13]

Answer:

Leak 1 = 3.43 m/s

Leak 2 = 2.42 m/s

Explanation:

Given that the top of the boot is 0.3 m higher than the leaks. 

Let height H = 0.3m and the acceleration due to gravity g = 9.8 m/s^2

From the figure, the angle of the leak 1 will be approximately equal to 45 degrees. While the leak two can be at 90 degrees.

Using the third equation of motion under gravity, we can calculate the velocity of leak 1 and 2

Find the attached files for the solution and figure

7 0
2 years ago
Other questions:
  • Waves that move by replacing particles
    7·1 answer
  • With the switch closed, how does the voltage across the 20-ω resistor compare to the voltage across the 10-ω resistor?
    6·1 answer
  • A child rides her bike at a rate of 12.0 km/hr down the street. A squirrel suddenly runs in front of her so she applies the brak
    6·2 answers
  • Calculate the work done when a 10 N force pushes against a cart 4.0 m
    15·2 answers
  • A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 90.0 m above the
    12·1 answer
  • A 55 year old woman is awakened by an excruciating pain that radiates from her right abdomen to her flank on the same side
    9·1 answer
  • What type of renewable energy uses Photovoltaics cells to capture the sun's energy
    5·2 answers
  • Prima problema este urgent
    8·1 answer
  • Pls help Which forces are shown on a free body diagram?
    14·1 answer
  • State coulomb's law mathematically
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!