Question: An Elevator and its load have a mass of 1200 kg.
a) what energy must be supplied to lif the elevator and its load ot a height of 100m? Answer: E = _________ Joules
b)If the elevator rises at a speed of 5 m/s, how long does it take to cover 100m? Answer t= __________ sec
c) What is the power supplied? Answer P = ________ Watts
Energy: E=MgL, where g=9.8m/s2 (squared) is the acceleration of gravity and Lis the distance through which a mass is moved against the force of gravity
Power: P = E/t
Intensity: I= P/A
The Attempt at a Solution
For part a, I used the first equation (E=MgL) and I got the answer of 1176 Joules
part b: at a rate of 5 m/s it would take 20 seconds; so t = 20 seconds
Part c: P=E/t is P= 1176/20 = 58.5 watts
Does this seem right?