The winning time for the 2005 annual race up 86 floors of the empire state building was 10 min and 49 s . the winner's mass was 60 kg . if each floor was 3.7 m high, what was the winner's change in gravitational potential energy? if the efficiency in climbing stairs is 25 %, what total energy did the winner expend during the race? how many food calories did the winner "burn" during the race? what was the winner's metabolic power in watts during the race up the stairs? express your answer using two significant figures.
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Ответ:
Explanation:
m = Mass of person = 60 kg
g = Acceleration due to gravity = 9.81 m/s²
t = Time taken = 10 min and 49 s
Total height
Potential energy is given by
The gravitational potential energy is![1.9\times 10^5\ J](/tpl/images/0466/3188/3c7f4.png)
The energy in the climb
Converting to kcal or Cal
The amount of energy used to climb![1.8\times 10^{2}\ kcal](/tpl/images/0466/3188/6954c.png)
Amount gone to heat
The amount burned![1.3\times 10^{2}\ kcal](/tpl/images/0466/3188/72893.png)
Power is given by
The power is![1.2\times 10^{3}\ W](/tpl/images/0466/3188/79acb.png)
Ответ:
yes.
Explanation: The light that will be incidented on that metal is visible light.
It depends on 3 factors:
1. The temperature
2. The specific heat capacity of the metal
3. The thermal conductivity of the metal.
The metal getting warmer also depend on the reflection and the absorption of light energy in which it will surely absorb some energy and not reflect all.
When visible light is absorbed by an object, the object converts the short wavelength light into long wavelength heat. This causes the object to get warmer.