Answer:
The physical change of the butter in the microwave is the butter melting
Explanation:
43 years old is the life expectancy
Answer:
Input impedance of this transformer is 50 ohms.
Explanation:
Given that,
Number of turns in the primary coil, 
Number of turns in the secondary coil, 
Output impedance of the transformer, 
The number of turns and the impedance ratio in the step down transformer is given by :

So, the input impedance of this transformer is 50 ohms. Hence, this is the required solution.
Answer:
Copper's composition does not change as its shape changes, hence it is a physical feature.
Explanation:
I’m sorry I wish I knew the answer but I don’t I need this for points I’m so sorry