What happens after sound waves reach the ear drum? A. The mechanical energy of the sound is turned into electrochemical energy of the nerve.
B. They are converted to mechanical waves that travel through the bones of the middle ear.
C. They are detected by the auditory nerve, which sends information about the sound to the brain.
D. The fluid in the cochlea moves back and forth, disrupting the hair cells in the ear.

explanation:

the masses of the objects and the distance between them

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.