A bridge usually has expansion joints. They allow the bridge to become slightly longer when it experiences thermal expansion. Lo
ok at the diagram below of the bridge joint. When the weather becomes cool, the “teeth” of the joint move away from each other. When the weather becomes warm, they move toward each other. Which statement is true about the particles that make up the bridge? A. When the sides of the joint are close together, the particles have more kinetic energy than they do when the sides are farther apart. B. When the sides of the joint are far apart, the particles have more kinetic energy than they do when the sides are closer together. C. The particles contain the same amount of kinetic energy no matter how much the bridge has expanded. D. The kinetic energy of the particles changes, but the amount it changes does not depend on the temperature of the bridge.
The independent variable in a research is that variable that the researcher wants to use to find out if it affects the dependable variable. The researcher manipulates the independent variable to see if it brings any change to the dependent variable. In this example, the researchers wants to test if classroom wall hangings can increase GPA, hence he wants to see if manipulating the classroom wall hangings can have an impact on the GPA of students.
