Time shifting occurs when
a. clocks move ahead one hour in the spring
b. works are copied and kept for future generations
c. individuals copy works to view at a later time
d. copyrighted materials comes into the public domain

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.

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero