A stunt plane turns off its motor and begins hurtling towards the earth. Every second, the pilot releases a puff of smoke for the audience to see. Neglecting air resistance as the plane falls, what does the audience notice about the puffs of smoke?
A)
The puffs of smoke are separated by random distances as the plane falls.
B)
The puffs of smoke have the same distance between them as the plane
falls.
The puffs of smoke have less and less distance between them as the plane
falls
D)
The puffs of smoke have more and more distance between them as the
plane falls

A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.