Recent content by Mohankpvk

I don't know about the cup experiment.But I learned in a forum that the sufficient condition for lift force in a wing is that the air stream should be redirected downwards(by any mechanism).Even the aerofoil cross section is not necessarily needed.The aerofoil cross section just increases the...

This is a link to a video which explains the reason due to which the fluid follows the curvature of the surface. In case of wings, the fluid follows the curvature and the inclination of the wings.So we can apply Newtons second law(in the vertical direction) to the stream of fluid to find the...

Thank you.That meant a lot to me.

I tried learning calculus using the book by Spivak.In this text, while introducing integrals the author explained a lot about partitioning the area under the curve and defined the integral.The way I understood this is, as we increase the number of divisions in the partition the lower sum and the...

Please suggest a book.Langauge doesn't matter, Ill try to find a translated version of it.

When my teacher was explaining about impulse-reaction inward Radial flow (Francis) turbine, he said that as the water moves from inlet to outlet tip of the blade, pressure energy of the water is used to do work and pressure reduces(reaction effect).Then he added that due to this decrease in...

Thank you.Nice answer.

Thank you for answering.So, to generate work, an engine cycle should be used to transfer heat between the system(at a higher state) and the environment(at ground state).If Carnot cycle is used, the net change in entropy of the combined system will be zero(at the end of complete cycle i.e. in...

I am using the book 'Fundamentals of thermodynamics' by Moran et al., In the exergy chapter, while deriving the expression for exergy ,a term representing the entropy generation in the combined system is neglected.Then the resulting expression is said to be the expression for exergy.But that...

Can this(image) be used as a proof that the direction of gradient gives the direction of steepest ascent(in 2D).Am I understanding it right ?.The function 'f' in the image is a scalar valued function.Please explain.

But why half if the gas is static?Please explain.I referred a few books for momentum transport but all of them used tensors.Is there any book(or other source) in which transport is explained only in 2d?

I was trying to understand the momentum transport between gas molecules in 2d.In the image below, it is stated that half of the molecules move up(positive velocity in y direction) and half negative.But the author didnt explain why he assumed it.

Thank you guys.And, the idea of storing excess energy as water potential energy is really nice.I have learned that A.C. power cannot be stored.So this is a good way to store it.

I haven't done it before, but I think the water will stop at the top of the glass.It will not rush out like a fountain.I think its because, the weight of the column is the reason for the pressure, so it can't lift itself.But initialy the water rushes to fill the straw, can this be used to do...

Is there any way to harness the hydrostatic pressure gradient to generate energy? The pressure at the surface of an ocean is atmospheric pressure.As we descend down the ocean, the pressure increases .After a point, the pressure will be very high.Why can't we use this pressure difference to do work?