How much Work?  1) How much work does an elevator motor do to
lift a 1000 kg elevator a height of 100 m?  Known variables:
mass (m): 1000 kg  height (h): 100m  Work = Force x Distance  We
need to find a force. Since there is gravity, all we have to do
is multiply it by the mass to get the Force.  1000 x 9.81 =
9810N  w = f x d, so w = 9810 x 100 = 981000 Joules.  W_{{\rm
ext}} =9.8×105 J 2) How much power must the motor supply to do
this in 50 s at constant speed?  Power = work / time.  P =
981000/50 = 19620 watts.  P =2.0×104 W  Leave a Reply