Question(Physics 20) about Power(watts)

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Homework Help Overview

The discussion revolves around calculating the power output of an elevator motor, given its mass and constant velocity. The subject area is physics, specifically focusing on concepts of power, work, and force.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between power, work, and time, questioning the necessity of time in the calculations. There is an exploration of the implications of constant velocity and zero acceleration on the problem.

Discussion Status

The conversation is active, with participants offering insights and questioning the need for certain variables. Some guidance has been provided regarding alternative formulas for power that may not require work directly.

Contextual Notes

There is uncertainty regarding the required information to solve the problem, particularly concerning the distance and time needed to calculate work. Participants are navigating through these constraints while adhering to homework guidelines.

Jyote25
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Homework Statement



An 8.5x102 elevator (including occupants) is pulled up at a constant velocity of 1.00 m/s by an electric motor. Calculate the power output of the electric motor.


Homework Equations



P=W/t

F=ma

v=d/t

a=v/t

The Attempt at a Solution




Having trouble figuring out what the acceleration and time are in order to find force times distance(Work)

Thank you for your help!
 
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Hi Jyote25! :smile:
Jyote25 said:
An 8.5x102 elevator (including occupants) is pulled up at a constant velocity …

Having trouble figuring out what the acceleration and time are in order to find force times distance(Work)

acceleration is zero

time of what? :confused:
 
Is time really needed to solve this equation? I guess not since we've already figured out that Acceleration is zero. But in order to find work we still need distance...ideas?
 
Jyote25 said:
Is time really needed to solve this equation? I guess not since we've already figured out that Acceleration is zero. But in order to find work we still need distance...ideas?

very true :smile:

but who asked you for the work? :confused:
 
Well, in order to find Power we need work to find Joules/second, which equates to a Watt, which is going to be the 'power output' of the motor. P=W/t
 
yeeees … well, since you don't know the work and you don't know the time, that's a teeny bit unhelpful! :biggrin:

hint: do you know any formula for power that involves force instead of work? :wink:
 

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