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ziafat111
@ziafat111
August 2021
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A cubical vessel of height 1 m is full of water . The minimum work done in taking water out from vessel will be?
Answers & Comments
rounakkabir2p1aku9
Verified answer
The vessel is cubical so its dimensions are 1×1
Vol of water
= 1 m³
= 1000 L
Mass of water = 1000 kg
Height = 1 m
g= 9.8 m/s
Thus, work done
= mgh
= 1000 × 9.8 × 1/2
=4900 J
11 votes
Thanks 26
kvnmurty
Verified answer
Suppose the cubical vessel is on top of floor. The water flows out and has a potential energy of 0, let us say.
The area of the base of the cubical vessel = 1 m * 1 m = 1 m²
volume = 1 m³
density of water = 1,000 kg/m³
mass of the water inside the vessel = 1,000 kg/m³ * 1 m³ = 1,000 kg
height of the center of gravity of vessel full of water = 1/2 height
= 1/2 m
To empty water from the vessel, water has to be lifted by 1/2 m from center of mass to the top of the vessel.
Minimum energy = m g h = 1000 * 10 * 1/2 = 5, 000 J
6 votes
Thanks 25
kvnmurty
:-)
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Answers & Comments
Verified answer
The vessel is cubical so its dimensions are 1×1Vol of water
= 1 m³
= 1000 L
Mass of water = 1000 kg
Height = 1 m
g= 9.8 m/s
Thus, work done
= mgh
= 1000 × 9.8 × 1/2
=4900 J
Verified answer
Suppose the cubical vessel is on top of floor. The water flows out and has a potential energy of 0, let us say.The area of the base of the cubical vessel = 1 m * 1 m = 1 m²
volume = 1 m³
density of water = 1,000 kg/m³
mass of the water inside the vessel = 1,000 kg/m³ * 1 m³ = 1,000 kg
height of the center of gravity of vessel full of water = 1/2 height
= 1/2 m
To empty water from the vessel, water has to be lifted by 1/2 m from center of mass to the top of the vessel.
Minimum energy = m g h = 1000 * 10 * 1/2 = 5, 000 J