Power Problem regarding elavator

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Homework Help Overview

The discussion revolves around calculating the power required for an elevator with a specified mass and efficiency to ascend a certain height over a given time period. The subject area includes concepts of energy, efficiency, and power in physics.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to apply the formula for power and gravitational potential energy but questions how to factor in the efficiency of the elevator. Other participants raise questions about the implications of non-ideal processes on energy requirements and efficiency calculations.

Discussion Status

Participants are exploring different interpretations of how efficiency affects the energy calculations. Some guidance has been offered regarding the relationship between ideal and non-ideal processes, but there is no explicit consensus on the correct approach to incorporate efficiency into the power calculation.

Contextual Notes

There is a focus on understanding the implications of efficiency values and how they relate to energy requirements in the context of the problem. The discussion highlights potential confusion around the application of efficiency in calculations.

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Homework Statement


An 255kg elevator which is 62.5% efficient climbs 52.5 meters in 25 seconds. What is the power required to do this.

I'm just not sure how to incorporate efficiency in this.

Homework Equations


P= change in energy over change in time
GPE=mgh

The Attempt at a Solution



P= 255*9.81*52.5/25 Do I need to multiplay the numerator by 0.625? Could you please explain why or why not? Thanks in advance :)
 
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Will a non ideal process (<100%) require more or less energy than an ideal process?
 
billy_joule said:
Will a non ideal process (<100%) require more or less energy than an ideal process?
More. would I have to multiplay it by 1.625 then?
 
No. 1/1.625 = 0.615 ≠ 0.625
 

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