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A 90 kg firefighter needs to climb the stairs of a 20-m-tall building while carrying a 40 kg backpack filled with gear. How much power does he need to reach the top in 55 s?

Respuesta :

The power required will be equal to 463.3 watt

Power is defined as the rate of work

[tex]P=\frac{W}{t}[/tex]

here P is power , W is work done , t is time taken

work done is defined as force times displacement

W=F×s

here s is displacement

here total force will be the weight of the firefighter plus the weight of gear

therefore F=(90+40)×9.8 N

so substituting value in equation of power we get

P=[tex]\frac{25480}{55}[/tex]

p=463.3 watt

learn more about power here:

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