If you wear kneepads when skating, after a fall to your knees it will take 3 times as long for them to come to a rest. how does this affect the change in momentum of your knees during the fall?
a. the change in momentum is the same with or without the kneepads
b. the change in momentum decreases by a factor of 9
c. the change in momentum decreases by a factor of 3
d. the change in momentum increases by a factor of 3

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.