An object is dropped and is in free fall. each second, the position of the object is marked. the distance between each mark is measured. which of the following is correct? a. as the object falls, the distance between marks decreases because the object's speed is constant. b. as the object falls, the distance between marks decreases because the object's speed is increasing. c. as the object falls, the distance between marks increases because the object's speed is increasing. d. as the object falls, the distance between marks increases because the object's speed is constant.

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

If element x has 99 protons how many electrons does it have

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.