Answer to Question #76283 in Electricity and Magnetism for Kevin Solski

Question

In the following question, does the mass fall at the rate of gravity?

How much electricity (in kilowatt hours?) Would be produced by a generator / turbine if a 1 tonne weight was suspended from a cable and gravity was pulling it down for 100 meters? Or what would the formula be to solve this?
All potential energy will transform into electricity.
E=mgh=1000*9.8*100=980000 J.
Now we need to express one kilowatt hour in joules: 1 kW*h=1000*3600 W*s=3600000 J.
Now we can express the amount of energy in kWh: E=980000/3600000=0.27 kWh.
Answer: 0.27 kWh.

Answer 1

In the following question, the mass fall at the acceleration due to the gravity. The rate (velocity) changes linearly with time:
v=gt.
The acceleration due to the gravity is
g=9.8 m/s^2 .