Gets ! read the following list of objects: the water behind a dam, a fully wound watch spring, a swing moving back and forth, an object moving on earth's surface, a roller coaster cart when it hits the lowest point of the track which statement is correct? a swing moving back and forth and the water behind a dam have only kinetic energy. a fully wound watch spring and a swing moving back and forth have only potential energy. the water behind a dam and a roller coaster cart when it hits the lowest point of the track have only potential energy. an object moving on earth's surface and a roller coaster cart when it hits the lowest point of the track have only kinetic energy.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.