An amusement park designer wants his swing to have a centripetal acceleration of 21 m/s2. If the velocity of the swing is 13 m/s, how long

should the chain on the swing be?

A. 8.5 m

B. 9.5 m

C. 9.0 m

D. 8.0 m

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.

Name the non metal condut electricity

Which atomic model was proposed as a result of j. j. thomson’s work?