Afarm truck moves due east with a constant velocity of 9.50 m/s on a limitless, horizontal stretch of road. a boy riding on the back of the truck throws a can of soda upward (fig. p4.54) and catches the projectile at the same location on the truck bed, but 16.0 m farther down the road. (a) in the frame of reference of the truck, at what angle to the vertical does the boy throw the can? (b) what is the initial speed of the can relative to the truck?

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.