Two research groups getting together and sharing thoughts, ideas, and research results is known as ... a) modeling
b) risk taking
c) observation
d) collaboration

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force

Aheavy boy and a lightweight girl are balanced on a massless seesaw. the boy moves backward, increasing his distance from the pivot point. what happens to the seesaw? it is impossible to predict without knowing additional information. the side the boy is sitting on will tilt downward. the side the girl is sitting on will tilt downward. nothing; the seesaw will remain balanced.