Question

A student weighing 200N climbs a flight of stairs 7.0m high in 8s. What power is required to perform this task?

Answer 1

Answer:

Power required, P = 175 watts

Explanation:

It is given that,

Weight of a student, F = mg = 200 N

The student climbs a flight of stairs of height, h = 7 m

Time taken, t = 8 s

We have to find the power required to perform this task. Work done per unit time is called the power required. Mathematically, it is given by :

$P=\dfrac{W}{t}$

W = work done

t = time taken

$P=\dfrac{mgh}{t}$

$P=\dfrac{200\ N\times 7\ m}{8\ s}$

P = 175 watts

Hence, the power required to complete this task is 175 watts.