The facial-feedback hypothesis tells us that? A. smiling makes a person feel better. b. facial expressions are of little importance in communicating. c. we can tell how a person is feeling by his or her facial expression. d. smiling is often a cover-up for emotional disorders...
July 16, 2012
Consider a system consisting of two oppositely charged spheres hanging by strings and separated by a distance r1, as shown in the accompanying illustration. Suppose they are separated to a larger distance r2 , by moving them apart along a track. What is the potential energy, ...
October 11, 2011