Answer:isotopes
Explanation:Isotopes form when the number of neutrons and atomic number change except for the protons don't change
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Explanation:
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=performance coefficient =2.1
T1= Low temperature
T2=high temperature
Now use algebra to find the high temperature

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

In celsius
T2=410.60-273.15=137.4° C
the high temperature needed to operate this refrigerator is C) 137.4° C
The speed as witch it is moving
im pretty sure it was tennis