boy weighing 35 kg carries a bag of 15 kg climbs stairs in 5 s. If there are 12 steps in the stairs, each of 15 cm height. Calculate the power of the boy.
aman94316:
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answer
it's easy
mass=35+15=50 kg
t=5 sec
h=15/100
p=w/t
work done =mgh
p=mgh/t
p=50×10×15/100×5
hence p=15
Answered by
27
Answer:-
Given:
- Mass of boy = 35kg
- Mass of bag = 15kg
- Number of stairs = 12
- Time take to cover one stair = 5s
- Height of each stair = 15cm = 0.15m
To Find:
- Power of body
Solution:
➥ Finding work done by the body
Total mass = 35 + 15 = 50kg
Total height of 12 stairs = 12 × 0.15 = 1.8 m
Here,
Potential Energy
= Mass × acceleration due to gravity × Height
= 50 × 10 × 1.8
= 500 × 1.8
= 900
So, the work done by the body is 900 J.
➥ Finding power of the body
Power
= Work done ÷ time
= 900 ÷ 5
= 180 Watt
∴ Power of the body is 180 Watt.
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