Ayesha is travelling in a train. As she is looking out of the window, another train on an adjacent track moving in the same direction, overtakes her train. Which of the following is TRUE? book Science up91 down13 ATo Ayesha, the other train will appear to be travelling FASTER than it actually is. BTo Ayesha, the other train will appear to be travelling SLOWER than it actually is. CTo Ayesha, the other train will appear to be travelling AT THE SAME SPEED as it actually is. DTo Ayesha, the other train will appear to be travelling in the opposite direction.

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.