Answer:
Ceramics
Explanation:
Ceramics are used to make cooktops if you look it up and according to my engineering and design class ceramics have high heat resistance and melting points, and make good electrical insulators.
Answer: Because if something goes wrong while you are flying it it will crash
Explanation:
Answer:
a)
, b) 
Explanation:
a) The coefficient of performance of a reversible refrigeration cycle is:

Temperatures must be written on absolute scales (Kelvin for SI units, Rankine for Imperial units)


b) The respective coefficient of performance is determined:



But:

The temperature at hot reservoir is found with some algebraic help:




