Two charges are brought together until they are 50.0 cm apart, causing the electric force between them to increase by a factor of exactly 4. what was their initial separation distance?

What do butterflies have on their feet which allows them to sense different strengths and types of nectar? a. mechanoreceptors b. acoustic receptors c. substratum receptors d. chemoreceptors

Bernie drove home from a vacation in 1.5 hours. he traveled a total distance of 60 miles. what was his average speed in miles per hour? a. 60 mph b. 90 mph c. 40 mph d. 55mph

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.