Power / energy question

  • #1
I'm only in high school physics so this may seem easy to you all XD

Homework Statement


The motor for an elevator can produce 14kW of power. The elevator has a mass of 1100kg, including its contents. At what constant speed will the elevator rise?


Homework Equations


P = E / T?
Ek = mv^2 / 2


The Attempt at a Solution



14000 = E / T
Ek = 1100v^2 / 2
 

Answers and Replies

  • #2
cepheid
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I'm only in high school physics so this may seem easy to you all XD

Homework Statement


The motor for an elevator can produce 14kW of power. The elevator has a mass of 1100kg, including its contents. At what constant speed will the elevator rise?


Homework Equations


P = E / T?
Ek = mv^2 / 2


The Attempt at a Solution



14000 = E / T
Ek = 1100v^2 / 2
If you use the fact that the power is the rate at which work is done by the motor (P = W/t), and that W = Fd, you can derive a whole new equation for power that consists of only quantities that are mentioned in the problem.
 

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