Distance
force
vector addition
decreases
projectile motion displacement
mass
increases
vector subtraction
linear motion time
speed
positive
equally
vector multiplication velocity
gravity
negative
unequally
centripetal motion
short answers:
20. which of the following variables are vectors: distance, speed, displacement, acceleration, or velocity?
21. every winter, greg flies hom to chicago (644 miles from little rock). it takes 2 hours. what is greg’s velocity?
22. a race car travels around a curve at a constant speed. is the race car accelerating? why or why not?

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Argon, neon, and xenon are examples of

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.