How Much Power Does a Man Generate Running Up Stairs Compared to a Light Bulb?

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Homework Help Overview

The discussion revolves around calculating the power generated by a man running up a flight of stairs, specifically comparing it to the energy expenditure of a light bulb. The problem involves concepts from mechanics and energy transfer.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculation of work done and its relation to power. Questions are raised about how to determine force and velocity, as well as how to calculate power from work over time.

Discussion Status

Some participants have provided guidance on how to approach the problem, particularly in calculating power from work done over time. There is an ongoing exploration of the necessary equations and concepts, with no explicit consensus reached yet.

Contextual Notes

Participants note a lack of familiarity with the problem type and express uncertainty about the relevant equations and calculations. The original poster mentions having difficulty recalling previous knowledge related to similar problems.

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Homework Statement



the man having the weight of 75kg is able to run up a 4.5 m high flight of stairs in 4s. determine the power generated. how long would a 100w light bulb have to burn to expend the same amount of energy?

Homework Equations





The Attempt at a Solution


I havnt done these types of questions for a while so I've forgotten, so far I've calculated the work done by weight -75*9.81 (4.50) = -3310.8
can anyone help me solve the rest pleasE?
thanks
 
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Power = rate of doing work
 
yea but i don't know how to do it
 
How much work is done in 4 seconds?
 
power=f.v but i don't know how to get the v and f?
 
As you know how much work was done in 4 secs, then divide by 4 secs and you have power!

Also, don't forget work = energy
 
Ok thanks
 

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