A boy pulls a bucket of water of total mass 5 kg from a well, which is 10 m deep in
10 . Calculate the power used by him.
Answers
Answer:
50 Watts
Explanation:
Power is the rate of doing work.
Power = work done/ time
Work done on a system by a constant force is the product of the component of the force in the direction of motion and the distance through which the force acts.
Work done = force x displacement
Force is the product of mass and acceleration.
F = ma
In this case, a = g
F = mg
Displacement = h
∴ W = mgh
Power = mgh/t
From the given question, we have
m = 5 kg, g = 10 , h = 10m, t = 10s
∴ P = (5 x 10 x 10)/10
= 50 Watts
Explanation:
Power is the rate of doing work.
Power = work done/ time
Work done on a system by a constant force is the product of the component of the force in the direction of motion and the distance through which the force acts.
Work done = force x displacement
Force is the product of mass and acceleration.
F = ma
In this case, a = g
F = mg
Displacement = h
∴ W = mgh
Power = mgh/t
From the given question, we have
m = 5 kg, g = 10 \frac{m}{s^{2} }
s
2
m
, h = 10m, t = 10s
∴ P = (5 x 10 x 10)/10
= 50 Watts
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