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

One Response to “How much Work?”

  1. You could certainly see your enthusiasm in the work you write. The arena hopes for even more passionate writers like you who aren’t afraid to say how they believe. All the time go after your heart.|

Leave a Reply