Express the vector r~ a b c d p r in terms of a~ , b~ , c~ , and d~ , the edges of a parallelogram. 1. r~ = c~ + d~ 2. r~ = a~ − b~ 3. r~ = a~ − c~ 4. r~ = a~ + d~ 5. r~ = b~ + d~ 6. r~ = b~ − a~ 7. r~ = a~ − d~ 8. r~ = b~ + a~ 9. r~ = d~ − a~ 10. r~ = c~ + b

Write the correct abbreviation for each metric unit

In a system, when potential energy decreases, then entropy also decreases. true false

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.