Kinetic energy of water pouring

[kox]

Hello. It's not a homework but it is kind of exercise. I was wondering what's the kinetic energy of water flow (for a certain amount) from a faucet. But I'm not sure if I got it right. So I counted how much volume of water is dropped in 30 seconds. It turned out it's about 5.6liters.
m=5.6kg // as 1 liter of water is almost 1kg
t=30s
l=1.256*10E-3m^2 // area of water dropping, cross-sectional area
Vol=5.6*10E-3m^3 // volume of water
Ek=mv^2/2
v=s/t
s=Vol/l
s=5.6*10E-3/1.256*10E-3 [m^3/m^2=m]
s=4.45m
v=4.45m/30s
v=0.148m/s
Ek=5.6kg*(0.148m/s)^2/2
Ek=5.6*0.0219kg*m^2/s^2
Ek=0.0613J
Ek=61.3mJ
So I got that pouring 5.6 liters of water realeses 61.3 milijoules. I thought it woul be a little more when I see water dropping at high pressure.
Did I get that right?
I don't know if I posted it in the right section. I'm ew here. It's not a homework but I'm afraid I would get my post deleted if I posted it in classic physics. Sorry I didn't use the template provided,but they didn't fit my post too good.

 

[mfb]

The kinetic energy of slowly moving masses is tiny. You get the same kinetic energy if you drop the water by a height of just ~1mm.

 

[kox]

I don't understand how is it equal to dropping water (how much?) from 1mm height? The water was dropping from more height and was at pressure. Could you explain?

 

[mfb]

In that case, some energy went to something else.

Dropping 5.6kg of water by a height of 1mm gives releases potential energy of mgh=5.6kg*10m/s²*0.001m = 0.056J = 56mJ.

 

[Nickie]

Hello,

Thank you for sharing your calculations on the kinetic energy of water pouring. Your approach is correct, and you have correctly calculated the kinetic energy of the water flow based on the given volume and time. However, it is important to note that the kinetic energy of the water flow will vary depending on factors such as the height from which the water is falling, the diameter of the faucet, and the pressure of the water flow.

In addition, the amount of kinetic energy may seem low because water is a relatively low-density material compared to other substances. However, when you consider the amount of water that is being released from a faucet in a given time, the total kinetic energy can add up quickly.

I would also like to mention that the kinetic energy of the water flow is only one aspect of the overall energy involved in the pouring process. There is also potential energy due to the height from which the water is falling and the energy required to pump the water to the faucet.

Overall, your calculations are correct, and it is always great to see individuals exploring and understanding the science behind everyday phenomena. Keep up the good work!