If the difference in apparent magnitude between stars changes from the fourth magnitude to the third magnitude, the brightness has changed about a0 times.

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.

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked