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
ss7ja [257]
3 years ago
15

An ideal Carnot refrigerator with a performance coefficient (COP) of 2.1 cools items inside of it to 5.0° C. What is the high te

mperature needed to operate this refrigerator?
A) 7° C
B) 589° C
C) 137° C
D) 16° C
Physics
1 answer:
otez555 [7]3 years ago
5 0

Answer:

the high temperature needed to operate this refrigerator is C) 137.4° C

Explanation:

Hello!

The carnot refrigeration cycle is one in which a machine absorbs heat from an enclosure and expels it to the surroundings, the equation that defines the COP performance coefficient for this cycle is:

COP=\frac{T1}{T2-T1}

COP=performance coefficient =2.1

T1=  Low temperature

T2=high temperature

Now use algebra to find the high temperature

COP=\frac{T1}{T2-T1}\\(T2-T1)=\frac{T1}{COP}\\T2=\frac{T1}{COP}+T1\\T2=T1(\frac{1}{COP} +1)

If we replace the values:

note = remember that the temperature must be in absolute units, for which we must add 273.15 to the low temperature to find the temperature in Kelvin

T1 = 5 + 273.15 = 278.15K

T2=278.15(\frac{1}{2.1} +1)=410.60k

In celsius

T2=410.60-273.15=137.4° C

the high temperature needed to operate this refrigerator is C) 137.4° C

You might be interested in
The forces acting on a leaf are
otez555 [7]

Affected plants

Explanation:

8 0
3 years ago
What is the starting and final energy for a battery?
EleoNora [17]
Electrical energy is the starting and final energy of a battery
8 0
2 years ago
Ngan has a weight of 314.5 N on Mars and a weight 833.0 N on Earth. What is Ngan's mass on Earth?
mr_godi [17]

Ngan's mass on earth is 85kg.

Ngan has a weight on Mars = 14.5 N

Ngan’s weight on Earth = 833.0 N

Ngan’s mass on Earth = ?

<span>Fg,earth = mg(earth)</span>

<span>M = Fg,earth </span><span>/ g(earth)</span>

<span>M = 833.0 N / 9.8 m/s2</span>

<span>M = 85 kg</span>

4 0
3 years ago
Read 2 more answers
About 3% of the water on Earth is freshwater. Only about 40% of that freshwater is available for human use. Why is so much fresh
Pie
A) it is frozen i think
7 0
3 years ago
Read 2 more answers
A person kicks a rock off a cliff horizontally with a speed of 20 m/s. It takes 7.0 seconds to hit the ground.
EastWind [94]
Urbfhdhehjrrr
Rrrrdndndndjdjdjdjjdjdjdjdkdmdmdmdkdjdjdjdjdid
6 0
2 years ago
Other questions:
  • The position of a particle is given by the expression x = 2.00 cos (6.00πt + 2π/5), where x is in meters and t is in seconds det
    11·1 answer
  • The total amount of energy in a closed system stays the same. t/f
    8·1 answer
  • What is the first step in the formation of a protostar?
    6·1 answer
  • You are asked to design an experiment which is similar to Match Graph activity. If you move 3m back from the motion sensor in 2s
    15·1 answer
  • A machine takes 0.5 seconds to move a brick 1 meter and put 100 Joules of energy into it. (hint: Power is the amount of energy t
    13·1 answer
  • In which scenario will the two objects have the greatest gravitational force
    13·2 answers
  • A match is being is an example of
    9·1 answer
  • Question 6 is the answer I need
    9·1 answer
  • How does a plane mirror work
    6·1 answer
  • Use the passage to answer the question.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!