Moving company uses a machine to raise a 900 newton refrigerator to the second floor of a building machine consists of a single pulley with a mechanical advantage of 1 how many newtons of input force will it take to raise the refrigerator

Mechanical advantage of a machine is the ratio of the output force over the input force or M=Fo/Fi. Since M=1, Fi=Fo, or the input force is equal to the output force. This means that to raise the refrigerator that weighs 900 N, we need the same input force of 900 N, or Fo=Fi=900 N.