Maybe you should re-think your original answers.Janiceleong26 said:
K.E of water in the reservoir is 0, K.E. of water entering the pipe = K.E. of water flowing out of pipe. But the question is asking for the change in energy of the water as it flows from X to Y.. Not from the reservoir to bottom of pipe :/SteamKing said:
correct.Janiceleong26 said:
Not correct.Janiceleong26 said:
Hmm..but I thought the water is flowing at a constant rate, which means constant v, thus constant K.E. throughout the pipe and to the turbine? :/phoenix95 said:correct.
Not correct.
Janiceleong26 said:
Yes it loses gravitational p.e.phoenix95 said:Answer this, does water loose gravitational potential energy during the flow?
If it does, then where does it re-appear? In what form? Then you may find out if the statement below is right or wrong.
Yeah, that is what I thought too..phoenix95 said:OK, This is what I thought...
Water is an incompressible fluid, which means it can't be deformed under stress. So elastic potential energy has no business here.
It definitely loses gravitational potential energy which has to appear as kinetic energy of the fluid.
, because the flow would be turbulent), then the kinetic energy is constant.). The problem clearly states that the water flows through the pipe and through the turbines. But the examiner says the pipe is sealed off. Haha okphoenix95 said:I can only explain it like this...
Let us assume that the water flows at constant rate along the pipe (which I think is not true
But the pipe is sealed off, so the water at the end of the pipe experiences pressure. I think this is what they referred to as 'Elastic potential energy being developed'.
Elastic potential energy is potential energy stored due to the deformation of an elastic object. Since water is incompressible there can be no such thing in this case. However, one can say that water develops energy due to pressure.
Or in other case the sealed end wall of the pipe is elastic. In this case the wall deforms and hence the elastic potential energy increases.
I think the problem lacks information, otherwise puts in too much conditions (no offense
The energy changes of water from a reservoir are primarily caused by the movement of water molecules, which is driven by temperature differences and the force of gravity.
The energy of water decreases as it flows from a reservoir due to friction and resistance from the surrounding environment. This results in a decrease in both kinetic and potential energy.
The energy changes of water in a reservoir are influenced by various factors such as the temperature of the water, the elevation or height of the reservoir, and the volume and flow rate of the water.
The forms of energy involved in water from a reservoir include potential energy, which is the energy stored in the water due to its position or elevation, and kinetic energy, which is the energy of motion as the water flows or moves.
The energy changes in water from a reservoir can have a significant impact on the surrounding environment. For example, the release of large amounts of water from a reservoir can lead to changes in temperature, erosion, and flooding downstream. It can also affect the habitats of plants and animals that depend on the water source.