How is the power related to the speed at which a body can be lifted ?How many kilograms will a man working at the power of 100W, will be able to lift at constant speed of 1m/s vertically ?(g=10m/s2) its meter per second square
Answers
Answered by
126
Power = work/time
work=force x displacement
force = mass x acceleration
acceleration=velocity/time
Therefore
Power=(velocity)*(mass)*(displacement) ÷ (time)*(time)
In the question
power,P=100W
velocity,v=1m/s
since time,t=1s
displacement, s=1m
acceleration,a=10m/s (acceleration to overcome gravity)
we have to find mass m
P=m×a×s÷t
100=m×10
m=10
work=force x displacement
force = mass x acceleration
acceleration=velocity/time
Therefore
Power=(velocity)*(mass)*(displacement) ÷ (time)*(time)
In the question
power,P=100W
velocity,v=1m/s
since time,t=1s
displacement, s=1m
acceleration,a=10m/s (acceleration to overcome gravity)
we have to find mass m
P=m×a×s÷t
100=m×10
m=10
Answered by
34
(A)Power = work / time
Work = Force*distance
Therefore , power = F*distance/time
Now distance/time = velocity
Therefore, F* v =work
(B) 100 watt = F*1m/s
F= mg
mg=100watt
g=10m/s2
Therefore, m= 100/10 =10 kg
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