To Build The Motor, Faraday Studied Electricity And Magnetism. Hope This helps!
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.
Equal because the book is not moving and the forces are balanced/equal
Answer:
Thermal energy
Explanation:
I believe it is because the movement of particles has a connection with the temperature. Example: Since gas particles move very fast, it must be hot and freshly occurred through heating process.
<span>atoms are made of particles that have a negative charge.</span>