Question

50 kg द्रव्यमान का एक लड़का 44 सीढ़ियां 10 सेकंड में चढत
है। यदि प्रत्येक सीढ़ी की ऊँचाई 15cm है, तो उनकी शक्ति का
कीजिए। दिया गया है = 10ms-2​

Answer 1

Answer :-

P = 330 w

Given :-

mass of boy = 50 kg

Time taken to climb on stairs = 10s

height of stair = 15 cm

To find :-

The power of boy.

Solution:-

Power → It is defined as the work done by a body per unit time.

Here ,

work is done against the gravity.

height of 44 stairs

h= 15 × 44

h= 660 cm , 6.6 m

→$P.E = m g h$

→$P.E = 50 \times 10 \times \dfrac{66}{10}$

→$P.E = 3300J$

Power of the boy is given by :-

→$P = \dfrac{E}{T}$

→$P = \dfrac{3300}{10}$

→$P = 330 w$

hence,

The power of the boy will be 330 w.