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Fazza3_uae
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Homework Statement
The motor of an elevator generates 12000 Watts of power when moving the elevator at constant speed of 2 m/s.what is the mass of elevator in kg ...??
There are 5 options for the answer.
a) 500 Kg b) 400 Kg c) 300 Kg d) 240 Kg e) 200 Kg
Homework Equations
P = W/t
The Attempt at a Solution
I tried to solve it like this ..
Power = Work / Time = Force * Displacement / Time = Force * Velocity = m*a*v
So m = P / a*v
where a is the gravitaional acceleration = 9.8 m/s2
v is the constant speed = 2 m/s
P is the power = 12,000 Watts
I simply plugged in the numbers & got 612 Kg which is obviously wrong. Any help would be apprecitaed. Thanks