Question 25 of 25 What is a limitation of modeling the effect of gravity on a falling object by using a ball dropped from different heights? A. Air slows down the fall of any object, including the ball. B. The weight of the ball can vary. C. Gravity varies slightly at different heights. D. The height that a ball bounces is affected by the height from which it was dropped.

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

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.