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Physics
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3 Dec 2020

Earl has a mass of 72 kg. What is the amount of power he requires to climb a flight of stairs that stands 10 m tall in 20 s? 

 

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Mechanics 1
Skill
Understanding the concept of power
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Amana Rangarajan
Amana RangarajanLv9
3 Dec 2020
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

What is the average power supplied by a 60 kg secretary running up a flight of stairs rising vertically 4 m in 4.2 s?

Bubba has a mass of 84.0 kilograms. He climbs a flight of stairs,going up a
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Energy is conventionally measured in Calories as well as in joules. One Calorie in nutrition is one kilocalorie, defined as 1 kcal = 4 186 J. Metabolizing 1 g of fat can release 9.00 kcal. A student decides to try to lose weight by exercising. He plans to run up and down the stairs in a football stadium as fast as he can and as many times as necessary. To evaluate the program, suppose he runs up a flight of 80 steps, each 0.150 m high, in 65.0 s. For simplicity, ignore the energy he uses in coming down (which is small). Assume a typical efficiency for human muscles is 20.0%. This statement means that when your body converts 100J from metabolizing fat, 20 J goes into doing mechanical work (here, climbing stairs). The remainder goes into extra internal energy. Assume the student’s mass is 75.0 kg. (a) How many times must the student-run the flight of stairs to lose 1.00 kg of fat? (b) What is his average power output, in watts and in horsepower, as he runs up the stairs? (c) Is this activity in itself a practical way to lose weight?

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