A 50 kg man moved 25 steps up in 20 seconds. Find his power, if each step is 16 cm high.
Answers 2
Answer:
98 W
Explanation:
Mass of the man = 50kg.
He moved 25 steps of 16cm high each within 20 seconds.
Here, If one step measures 16cm.
Then, 25 steps would measure = 16*25 = 400cm or 4m
Calculating the force :
Force = m*g
g = 9.8m/s²
mass= 50kg.
force = 50 × 9.8
= 490N.
Work done by the man = force * displacement.
Where, The force is 490N.
Total displacement is 4m.
So, the work done by him is= 490*4
=1960 joules.
Power = Work done/Time
Where, Work done = 1960
Time= 20s
Power= 1960/20
= 98 W
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Author:
persyfrederick
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Answer:
A 50 kg man moved 25 steps up in 20 seconds. The power is 100W, if each step is 16 cm high.
Explanation:
A man whose mass is 50kg climbs up 25 steps of a stair in 20s
each step is 16 cm high
Height at 25 steps , h=25×0.2=5 m
Change in potential energy , =mgh=50 × 10 × 5 =2500 J
So, Work done by the man , W=2500 J
Power used , P= W/t= 2500/25 =100 W
Hence the power is 100 W.
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Author:
trinidadfarmer
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