Question

A 60-kg woman runs up a staircase 15 m high (vertically) in 20 s.

Required:
a. How much power does she expend?
b. What is her horsepowerrating.

Answer 1

(a) 441 W (b) 0.59 hP

Step-by-step explanation:

Given that,

Mass of a woman, m = 60 kg

Height of a staircase, h = 15 m

Time, t = 20 s

(a) We need to find the power she expend. Work done per unit time is called power. It is given by :

`P=(W)/(t)\\\\P=(mgh)/(t)\\\\P=(60* 9.8* 15)/(20)\\\\P=441\ W`

( b) Since, 1 hP = 745.7 W

P = 0.59 hP