a) A boy of mass of 50kg runs up a staircase of 45 steps in 9s. If the height of each step is 15 cm,
find his power.
b) Define 1 watt of power
Answers
Answered by
1
Answer:
Given mass of body
(m)=
50kg
h= 45× 15= 675cm= 6.75m
δ=
10m
t= 9s
Potential energy
=
mgh
=
(50×10×6.75)5
= 33755
Power of the body =
Time
Potentialenergy
=9
3375
=375W
Answered by
0
Explanation:
since, each step of stair case denotes 15cm
so, total height (h) of 45 step = 45*15=675cm or 6.75m
work done by the boy w=mg*h
=50*10*6.75
w=3375 joule
we know that,
power(p)=workdone(w)/time taken(t)
power=3375/9 js-1
power = 375 js-1
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