Conceptual Examples

Who does more work in raising the piano to the ceiling? Person A or Person B?
See transparency for problem setup.

  1. WA > Wb
  2. WA < Wb
  3. WA = Wb

A mover raises a 100 kg piano at a constant rate using the frictionless pulley system shown on the transparency. With how much force is he pulling on the rope?
Ignore friction, the mass of the rope, and assume g = 10 m/s2.

  1. 2000 N
  2. 1000 N
  3. 500 N
  4. 200 N